FRESH POND RESEARCH INSTITUTE INC

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Plain text FRESH POND RESEARCH INSTITUTE INC. furp.org, nonprofit organization profile, tax years 2009–2024. https://furp.org/org/fresh-pond-research-institute-inc-043278769. Retrieved 2026-11-01.

APA furp.org. (n.d.). FRESH POND RESEARCH INSTITUTE INC [Nonprofit organization profile; tax years 2009–2024]. Retrieved November 1, 2026, from https://furp.org/org/fresh-pond-research-institute-inc-043278769

MLA “FRESH POND RESEARCH INSTITUTE INC.” furp.org, tax years 2009–2024, https://furp.org/org/fresh-pond-research-institute-inc-043278769. Accessed 1 Nov. 2026.

Retrieved 2026-11-01; covers tax years 2009–2024. Data: furp.org, CC BY 4.0.

2024 · Form 990 · revenue $459K · expenses $342K · assets $1.8M

EIN
04-3278769
Address
16 BROOKFORD ST, CAMBRIDGE, MA 02140-1603
Website
www.freshpond.org
NTEE code
U20
Exempt type
501(c)(3): charitable, religious, educational, scientific or literary (corporation)
Ruling date
October 1995 (when the IRS recognized its exemption)
IRS status
Exempt (unconditional) (IRS Business Master File) IRS data ↗
Tax-deductible donations
Yes: listed in IRS Publication 78 (public charity) Pub 78 ↗
Foundation status
Public charity supported by the public (170(b)(1)(a)(vi))
Cross-check
ProPublica Nonprofit Explorer

Mission

Research on Demography, Epidemiology, Ecology, Evolution, Population Biology, History and Philosophy of Biology

Each tax year counts once: when a return was amended, only the latest return for that period is used below (superseded returns stay listed, greyed, under Finances).

People paid by the organization

1 person paid across every filing: current people first, then by total pay from this organization. Organizations counts every nonprofit each person appears on.

NameLatest titleYearsLatest year payTotal pay from hereOrganizations
Steven Orzack President2009-2024 $57,000$362,731 1

Officers and directors, no compensation reported

5 people listed on the returns with $0 (or no amount) in every compensation column: current people first. Hours are as filed on the latest return each person appears on.

NameLatest titleYearsHrs/wk (latest)CompensationOrganizations
William Etges Director2009-2024 1 $0 reported 1
Daniel Kindlon Director2009-2024 1 $0 reported 1
Martin Kreitman Director2009-2024 1 $0 reported 1
William Parsons Director2009-2024 1 $0 reported 1
Shripad Tuljapurkar Director2009-2024 1 $0 reported 1

People by year

2024 · 6 people listed · 1 paid, $57K · 1 employee · 0 volunteers
NameTitleHrs/wkFrom orgFrom relatedOtherTotalOrgs
Steven Orzack President40 $57,000$0$0 $57,0001
William Etges Director1 $0$0$0 $01
Daniel Kindlon Director1 $0$0$0 $01
Martin Kreitman Director1 $0$0$0 $01
William Parsons Director1 $0$0$0 $01
Shripad Tuljapurkar Director1 $0$0$0 $01
2023 · 6 people listed · 1 paid, $57K · 1 employee · 0 volunteers
NameTitleHrs/wkFrom orgFrom relatedOtherTotalOrgs
Steven Orzack President40 $57,000$0$0 $57,0001
William Etges Director1 $0$0$0 $01
Daniel Kindlon Director1 $0$0$0 $01
Martin Kreitman Director1 $0$0$0 $01
William Parsons Director1 $0$0$0 $01
Shripad Tuljapurkar Director1 $0$0$0 $01
2022 · 6 people listed · 1 paid, $38K · 1 employee · 0 volunteers
NameTitleHrs/wkFrom orgFrom relatedOtherTotalOrgs
Steven Orzack President40 $38,000$0$0 $38,0001
William Etges Director1 $0$0$0 $01
Daniel Kindlon Director1 $0$0$0 $01
Martin Kreitman Director1 $0$0$0 $01
William Parsons Director1 $0$0$0 $01
Shripad Tuljapurkar Director1 $0$0$0 $01
2021 · 6 people listed · 1 paid, $38K · 1 employee · 0 volunteers
NameTitleHrs/wkFrom orgFrom relatedOtherTotalOrgs
Steven Orzack President40 $38,000$0$0 $38,0001
William Etges Director1 $0$0$0 $01
Daniel Kindlon Director1 $0$0$0 $01
Martin Kreitman Director1 $0$0$0 $01
William Parsons Director1 $0$0$0 $01
Shripad Tuljapurkar Director1 $0$0$0 $01
2020 · 6 people listed · 1 paid, $48K · 1 employee · 0 volunteers
NameTitleHrs/wkFrom orgFrom relatedOtherTotalOrgs
Steven Orzack President40 $47,500$0$0 $47,5001
William Etges Director1 $0$0$0 $01
Daniel Kindlon Director1 $0$0$0 $01
Martin Kreitman Director1 $0$0$0 $01
William Parsons Director1 $0$0$0 $01
Shripad Tuljapurkar Director1 $0$0$0 $01
2019 · 6 people listed · 1 paid, $53K · 1 employee · 0 volunteers
NameTitleHrs/wkFrom orgFrom relatedOtherTotalOrgs
Steven Orzack President40 $52,725$0$0 $52,7251
William Etges Director1 $0$0$0 $01
Daniel Kindlon Director1 $0$0$0 $01
Martin Kreitman Director1 $0$0$0 $01
William Parsons Director1 $0$0$0 $01
Shripad Tuljapurkar Director1 $0$0$0 $01
2009 · 6 people listed · 1 paid, $73K · 3 employees · 0 volunteers
NameTitleHrs/wkFrom orgFrom relatedOtherTotalOrgs
STEVEN ORZACK President40 $61,513$0$10,993 $72,5061
WILLIAM ETGES Director1 $0$0$0 $01
DANIEL KINDLON Director1 $0$0$0 $01
MARTIN KREITMAN Director1 $0$0$0 $01
WILLIAM PARSONS Director1 $0$0$0 $01
SHRIPAD TULJAPURKAR Director1 $0$0$0 $01

Highest-paid independent contractors

No independent contractors reported.

Who gave

Contributor names are not public for this form type.

Public charities filing Form 990 or 990-EZ report large donors on Schedule B, but the IRS withholds their names and addresses from public copies. Private foundations (990-PF) are different: their contributors are public.

Finances

Newest first. Each filing: its name on one row, its figures on the row beneath. Greyed filings are superseded by a later return for the same period and are left out everywhere else on this page.

RevenueExpensesAssetsNet assetsContributionsProgram revenueOfficer payEmployeesVolunteers
2024 · Form 990 period ending 2025-10-31 · view filing · original 990 ↗
$459,354$342,486 $1,766,306$1,830,798 $184,366$0 $85,19110
2023 · Form 990 period ending 2024-10-31 · view filing · original 990 ↗
$234,990$155,760 $1,506,986$1,514,948 $182,496$0 $86,86110
2022 · Form 990 period ending 2023-10-31 · view filing · original 990 ↗
$132,667$159,253 $1,192,384$1,105,655 $112,528$0 $90,03210
2021 · Form 990 period ending 2022-10-31 · view filing · original 990 ↗
$234,764$143,489 $1,139,869$1,082,185 $210,467$0 $85,21510
2020 · Form 990 period ending 2021-10-31 · view filing · original 990 ↗
$125,664$124,468 $1,265,897$1,069,846 $102,953$0 $69,69710
2019 · Form 990 period ending 2020-10-31 · view filing · original 990 ↗
$125,207$121,189 $971,960$678,212 $102,796$0 $69,10310
2009 · Form 990 period ending 2010-10-31 · view filing · original 990 ↗
$37,007$127,659 $377,390$291,218 $36,354$0 $66,50030

Funders of this organization

Not reported: no grants to this organization appear in the filings we have (tax years 2010 to 2025).

Nearby + Similar BETA

Organizations like this one: what they do and who they are linked to

Same category: NTEE code and revenue

Ranked without any AI: same NTEE code first, then the same NTEE group; then revenue within 2x, 5x or 10x; then the same state; then similar name and mission text. Same state only · More (100)

OrganizationStateNTEELatest revenueLatest expensesTop-paid titleTop payWhy similar
INSTITUTE OF ADVANCED SCIENCESMAU20 $468,891$401,710 PRESIDENT$0 Same NTEE code U20, revenue within 2x, same state
AMERICAN FEDERATION FOR MEDICAL RESEARCHMAU20 $498,779$438,002 PRESIDENT/PRESIDENT-ELECT$0 Same NTEE code U20, revenue within 2x, same state
SCIENCE FOR AMERICA INCMAU20 $659,896$4,409,039 COO & TREASURER$369,488 Same NTEE code U20, revenue within 2x, same state
TRICONTINENTAL LTDMAU20 $857,945$3,745,069 Secretary$82,166 Same NTEE code U20, revenue within 2x, same state
MARINE RESEARCH HUB OF SOUTH FLORIDA INCFLU20 $296,244$320,735 PRESIDENT$0 Same NTEE code U20, revenue within 2x
INSTITUTE FOR POPULATION HEALTH SCIENCESILU20 $260,556$50,166 Director$12,000 Same NTEE code U20, revenue within 2x
FLORIDA FRUIT & VEGETABLE RESEARCH & EDUCATION FOUNDATION INCFLU20 $485,783$365,728 CHAIR$0 Same NTEE code U20, revenue within 2x
COLLABORATIVE EARTH INSTITUTECAU20 $571,385$701,506 Executive Dir.$60,500 Same NTEE code U20, revenue within 2x
PALEOCULTURAL RESEARCH GROUPCOU20 $318,728$369,788 RESEARCH DIRECTOR$54,975 Same NTEE code U20, revenue within 2x
SELF INSTITUTEOKU20 $445,230$54,857 Director$0 Same NTEE code U20, revenue within 2x
FLORIDA INTERNATIONAL UNIVERSITY RESEARCH FOUNDATION INCORPORATEDFLU20 $473,530$147,242 VICE PRESIDENT$837,762 Same NTEE code U20, revenue within 2x
PARADOX SCIENCE INSTITUTEFLU20 $800,000$658,529 PRESIDENT$0 Same NTEE code U20, revenue within 2x
SPRITELY NETWORKED COMMUNITIES INSTITUTEDEU20 $291,270$842,656 Executive Director (incoming), CTO, President$137,876 Same NTEE code U20, revenue within 2x
HUMAN POTENTIAL LAB INCCTU20 $747,585$665,334 Chief Communications Officer$165,260 Same NTEE code U20, revenue within 2x
VIRGINIA BIOSCIENCES HEALTH RESEARCH CORPORATIONVAU20 $676,190$5,292,252 PRESIDENT & CEO$200,000 Same NTEE code U20, revenue within 2x
CLIMATE SOLUTIONS FOUNDATION INCDCU20 $770,000$1,023,460 BOARD CO-CHAIR$120,000 Same NTEE code U20, revenue within 2x
BIBLE ARCHEOLOGY SEARCH AND EXPLORATION FOUNDATIONCOU20 $263,551$161,354 President$20,183 Same NTEE code U20, revenue within 2x
EDUEVERYTHING INCOHU20 $517,958$488,508 EXECUTIVE DI$0 Same NTEE code U20, revenue within 2x
CONSUMER BRANDS ASSOCIATION FOUNDATION INCVAU20 $281,213$206,021 PRESIDENT & CEO (END 08/24)$1,515,045 Same NTEE code U20, revenue within 2x
INTERNATIONAL SOCIETY FOR CNS DRUG DEVELOPMENT INCCAU20 $597,294$491,673 CFO/SECRETARY$260,138 Same NTEE code U20, revenue within 2x
RHODE ISLAND NATURAL HISTORY SURVEYRIU20 $701,102$573,714 President and director$0 Same NTEE code U20, revenue within 2x
CLIMATE IMPACT LAB INCCAU20 $523,757$305,046 DIRECTOR$0 Same NTEE code U20, revenue within 2x
SOCIEDAD DE INVESTIGACION CIENTIFICA INCPRU20 $545,382$455,691 EXECUTIVE DI$34,588 Same NTEE code U20, revenue within 2x
PASADENA BIOSCIENCE CENTER INCCAU20 $711,638$811,257 Director$0 Same NTEE code U20, revenue within 2x
VAGUS NERVE SOCIETY VNS INCFLU20 $647,253$525,462 DIRECTOR$0 Same NTEE code U20, revenue within 2x

Who funds organizations like this

Grantors that funded the 100 most similar organizations. Ranked by total given to them. Foundations (990-PF) and donor-advised fund sponsors only. Same matching as Funders above (by EIN, or by name for foundations).

GrantorTypeTotal givenGrantsOrganizations fundedYearsWhich ones
GS DONOR ADVISED PHILANTHROPY FUND FOR WEALTH MANAGEMENT INC DAF sponsor$19,371,40023 52017–2024 TRICONTINENTAL LTD; HOROLOGICAL SOCIETY OF NEW YORK INC; THE CENTER FOR THE RESEARCH OF EARLY CHRISTIAN DOCUMENTS; CLIMATE IMPACT LAB INC and 1 more
DONOR ADVISED CHARITABLE GIVING DAF sponsor$9,694,02638 142014–2024 SCIENCE FOR AMERICA INC; FOUNDATION FOR ANIMAL CARE ANDEDUCATION; DHODY RESEARCH INSTITUTE; COUNCIL FOR THE ADVANCEMENT OF SCIENCE WRITING INC and 10 more
APHORISM FOUNDATION Private foundation$9,000,0002 12023–2024 SCIENCE FOR AMERICA INC
FIDELITY INVESTMENTS CHARITABLE GIFT FUND DAF sponsor$4,516,46266 212016–2024 CLIMATE IMPACT LAB INC; FOUNDATION FOR ANIMAL CARE ANDEDUCATION; QUEST SCIENCE CENTER; HUMAN POTENTIAL LAB INC and 17 more
THE SAN DIEGO FOUNDATION DAF sponsor$4,106,57820 42011–2024 ELEMENTARY INSTITUTE OF SCIENCE; TREOBYTES INC; HEFFTER RESEARCH INSTITUTE; FOUNDATION FOR ANIMAL CARE ANDEDUCATION
NATIONAL PHILANTHROPIC TR DAF sponsor$2,077,51127 132015–2024 SOLVING FOR SCIENCE; THE CITIZEN SCIENTISTS LEAGUE INC; HOROLOGICAL SOCIETY OF NEW YORK INC; HEFFTER RESEARCH INSTITUTE and 9 more
THE ERIC AND WENDY SCHMIDT FUND FOR STRATEGIC INNOVATION Private foundation$1,800,0001 12023–2023 SCIENCE FOR AMERICA INC
SILICON VALLEY COMMUNITY FOUNDATION DAF sponsor$1,650,00013 52014–2024 OPENREVIEW FOUNDATION; SCIENCE FOR AMERICA INC; CITIZEN SCIENCE FOUNDATION; AUSTIN SCIENCE EDUCATION FOUNDATION and 1 more
FILECOIN FOUNDATION FOR THE DECENTRALIZED WEB Private foundation$1,206,9442 12021–2022 SPRITELY NETWORKED COMMUNITIES INSTITUTE
GULF COAST COMMUNITY FOUNDATION INC DAF sponsor$1,028,80012 12013–2024 THE CITIZEN SCIENTISTS LEAGUE INC
COMBINED JEWISH PHILANTHROPIES OF GREATER BOSTON INC DAF sponsor$1,000,0002 12022–2023 SCIENCE FOR AMERICA INC
JEWISH COMMUNAL FUND DAF sponsor$1,000,0001 12023–2023 SCIENCE FOR AMERICA INC
EVERY ORG Private foundation$791,6562 12023–2024 SPRITELY NETWORKED COMMUNITIES INSTITUTE
JEWISH COMMUNITY FOUNDATION OF SAN DIEGO DAF sponsor$723,63821 22011–2024 ELEMENTARY INSTITUTE OF SCIENCE; FOUNDATION FOR ANIMAL CARE ANDEDUCATION
RANCHO SANTA FE FOUNDATION DAF sponsor$715,95925 22011–2025 FOUNDATION FOR ANIMAL CARE ANDEDUCATION; ELEMENTARY INSTITUTE OF SCIENCE

The full list · all similar organizations

Where the money went

Every expense line on each return, biggest first: Form 990 Part IX (with its program, management and fundraising columns), 990-EZ Part I, or 990-PF Part I. Event marks lines the organization itself describes as events. “Events” in each summary adds those lines, conferences and meetings, and the direct costs of fundraising events. Unusual is not the same as improper. Many of these patterns have ordinary explanations. Check the filing.

2024 · Form 990 · $342,486 spent · pay $106,429 · grants $9,000 · events $0
LineAs describedTotalProgramManagementFundraisingShare
Fees: legal $119,104$0$119,104$0 34.8%
Pay: officers, directors, trustees, key employees $85,191$76,672$8,519$0 24.9%
Other (as described)Equipment $55,465$55,465$0$0 16.2%
Interest $34,261$0$34,261$0 10.0%
Other employee benefits $20,566$18,509$2,057$0 6.0%
Depreciation and depletion $11,312$11,266$46$0 3.3%
Grants to US individuals $9,000$9,000-- 2.6%
Other (as described)Dining, Postage, Miscellaneous (research supplies) $4,333$4,181$152$0 1.3%
Fees: investment management $1,227$0$1,227$0 0.4%
Payroll taxes $672$605$67- 0.2%
Information technology $671$604$67$0 0.2%
Other (as described)Membership $543$458$85$0 0.2%
Other (as described)Travel $73$73$0$0 0.0%
Fees: accounting $68$0$68$0 0.0%
Total$342,486100%

View the filing

2023 · Form 990 · $155,760 spent · pay $105,293 · grants $0 · events $0
LineAs describedTotalProgramManagementFundraisingShare
Pay: officers, directors, trustees, key employees $86,861$78,175$8,686$0 55.8%
Interest $37,509$0$37,509$0 24.1%
Other salaries and wages $15,796$15,796$0$0 10.1%
Fees: legal $8,550$0$8,550$0 5.5%
Payroll taxes $2,636$2,372$264$0 1.7%
Fees: investment management $1,398$0$1,398$0 0.9%
Information technology $1,216$1,094$122$0 0.8%
Other (as described)MEMBERSHIP $614$529$85$0 0.4%
Other (as described)EQUIPMENT $479$431$48$0 0.3%
Travel $358$358$0$0 0.2%
Depreciation and depletion $236$212$24$0 0.2%
Fees: accounting $66$0$66$0 0.0%
Other (as described)DINING, POSTAGE, MISCELLANEOUS $41$13$28$0 0.0%
Total$155,760100%

View the filing

2022 · Form 990 · $159,253 spent · pay $89,927 · grants $0 · events $418
LineAs describedTotalProgramManagementFundraisingShare
Pay: officers, directors, trustees, key employees $90,032$81,029$9,003$0 56.5%
Fees: other services $33,100$33,100$0$0 20.8%
Interest $30,384$0$30,384$0 19.1%
Information technology $1,391$1,252$139$0 0.9%
Fees: investment management $1,344$0$1,344$0 0.8%
Travel $1,271$1,271$0$0 0.8%
Other (as described)Membership $537$452$85$0 0.3%
Conferences, conventions and meetings $418$418$0$0 0.3%
Other (as described)Dining $295$295$0$0 0.2%
Depreciation and depletion $257$231$26$0 0.2%
Other (as described)Miscellaneous $245$245$0$0 0.2%
Other (as described)Postage $40$40$0$0 0.0%
Fees: accounting $35$0$35$0 0.0%
Office expenses $9$0$9$0 0.0%
Payroll taxes -$105-$95-$10$0 -0.1%
Total$159,253100%

View the filing

2021 · Form 990 · $143,489 spent · pay $121,307 · grants $0 · events $0
LineAs describedTotalProgramManagementFundraisingShare
Pay: officers, directors, trustees, key employees $85,215$76,694$8,521$0 59.4%
Other salaries and wages $34,800$34,800$0$0 24.3%
Interest $15,125$0$15,125$0 10.5%
Travel $2,368$2,368$0$0 1.7%
Fees: investment management $2,004$0$2,004$0 1.4%
Payroll taxes $1,292$1,163$129$0 0.9%
Information technology $1,068$961$107$0 0.7%
All other expenses $478$182$296$0 0.3%
Other (as described)Membership $470$300$170$0 0.3%
Depreciation and depletion $210$189$21$0 0.1%
Other (as described)Dining $199$199$0$0 0.1%
Other (as described)Telephone $134$0$134$0 0.1%
Fees: accounting $116$0$116$0 0.1%
Other (as described)Postage $10$0$10$0 0.0%
Total$143,489100%

View the filing

2020 · Form 990 · $124,468 spent · pay $106,363 · grants $0 · events $0
LineAs describedTotalProgramManagementFundraisingShare
Pay: officers, directors, trustees, key employees $69,697$62,727$6,970$0 56.0%
Other salaries and wages $36,718$36,718$0$0 29.5%
Interest $12,981$0$12,981$0 10.4%
Fees: investment management $2,248$0$2,248$0 1.8%
Information technology $1,047$941$106$0 0.8%
Other (as described)Membership $572$572$0$0 0.5%
Depreciation and depletion $508$457$51$0 0.4%
All other expenses $275$0$275$0 0.2%
Office expenses $267$0$267$0 0.2%
Other (as described)Equipment $85$85$0$0 0.1%
Other (as described)Dining $68$68$0$0 0.1%
Fees: accounting $27$0$27$0 0.0%
Other (as described)Postage $27$27$0$0 0.0%
Payroll taxes -$52-$47-$5$0 -0.0%
Total$124,468100%

View the filing

2019 · Form 990 · $121,189 spent · pay $99,123 · grants $0 · events $0
LineAs describedTotalProgramManagementFundraisingShare
Pay: officers, directors, trustees, key employees $69,103$62,193$6,910$0 57.0%
Other salaries and wages $22,520$22,520$0$0 18.6%
Interest $16,738$0$16,738$0 13.8%
Payroll taxes $7,500$6,750$750$0 6.2%
Fees: investment management $2,210$0$2,210$0 1.8%
Information technology $929$836$93$0 0.8%
Depreciation and depletion $594$535$59- 0.5%
Travel $496$496$0$0 0.4%
Office expenses $300$0$300$0 0.2%
Other (as described)Dining $291$291$0$0 0.2%
Other (as described)Membership $215$130$85$0 0.2%
All other expenses $176$158$18$0 0.1%
Other (as described)Equipment $85$85$0$0 0.1%
Other (as described)Postage $22$0$22$0 0.0%
Fees: accounting $10$0$10$0 0.0%
Total$121,189100%

View the filing

2009 · Form 990 · $127,659 spent · pay $119,508 · grants $0 · events $816
LineAs describedTotalProgramManagementFundraisingShare
Pay: officers, directors, trustees, key employees $66,500$53,200$13,300$0 52.1%
Other salaries and wages $29,250$29,250$0$0 22.9%
Other employee benefits $16,812$15,201$1,611$0 13.2%
Payroll taxes $4,706$3,765$941$0 3.7%
Pension plan contributions $2,240$1,792$448$0 1.8%
Other (as described)Bank Charges $2,080$0$2,080$0 1.6%
Fees: accounting $1,616$0$1,616$0 1.3%
Travel $922$473$449$0 0.7%
Conferences, conventions and meetings $816$816$0$0 0.6%
Information technology $801$641$160$0 0.6%
Interest $779$0$779$0 0.6%
Fees: legal $600$0$600$0 0.5%
Other (as described)Misc equipment $274$219$55$0 0.2%
Office expenses $124$113$11$0 0.1%
All other expenses $74$0$74$0 0.1%
Other (as described)Membership Dues $65$65$0$0 0.1%
Total$127,659100%

View the filing

Federal grants and contracts

Awards from USAspending.gov to a recipient with this organization's name and zip code. Obligations by federal fiscal year (October to September); each award links to its page on usaspending.gov.

Fiscal yearGrants and other assistanceContractsAwards
2022$15,000$01
2020$0$01
2009$75,710$01
2008$74,486$01
Largest awards · 3 shown
YearAgencyKindProgramDescriptionObligated
2022Small Business AdministrationGrant or other assistanceECONOMIC INJURY DISASTER LOAN EMERGENCY ADVANCE 59.072AWARDTYPE: DIRECT PAYMENT FOR SPECIFIED USE ACTIVITIES TO BE PERFORMED: CONTINUE BUSINESS DELIVERABLES: ECONOMIC RELIEF TO SMALL BUSINESSES IMPACTED BY COVID-19$15,000
2009National Institutes of HealthGrant or other assistancePOPULATION RESEARCH 93.864THE DEMOGRAPHIC TRAJECTORY OF THE SEX RATIO IN HUMAN PREGNANCY$75,710
2008National Institutes of HealthGrant or other assistancePOPULATION RESEARCH 93.864THE DEMOGRAPHIC TRAJECTORY OF THE SEX RATIO IN HUMAN PREGNANCY$74,486

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