The testicles are the primary male reproductive organs. They produce gametes, or sperm, and they secrete hormones, primarily testosterone.
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2017
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April
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- 'Anumeric' People: When Languages Have No Words fo...
- Animal Sex: How Lobsters Do It
- Russia from Above: A Glimpse at a Vast Landscape
- How Would Just 2 Degrees of Warming Change the Pla...
- Virgin Galactic Aims to Fly Space Tourists in 2018...
- The Most Interesting Science News Articles of the ...
- Amazing Images: The Best Science Photos of the Week
- Hopewell Culture
- 'Giant Hurricane' on Saturn: 1st Images Back from ...
- Los Angeles Subway Dig Uncovers Ice Age Mammal Bon...
- Malaria on Rise in US As Travelers Return with Dis...
- NASA's $200M Spacesuit Problem Threatens Its Deep-...
- Grading Trump's First 100 Days in Office: A Scienc...
- Beastly Romances: Famous Human-Animal Couples (Ima...
- Goya's Mystery Illness: Nearly 200 Years Later, Do...
- New Prostate Cancer Screening Guidelines Don't Go ...
- Are Cholesterol, Saturated Fat Less Important to H...
- Physicist Describes 45 Gruesome Ways to Die (or Not)
- The History of the 'First 100 Days': How Did Most ...
- Researchers Probe Viability of Amino Acids in Alie...
- Photos: Inside the Bizarre World of the Crested Sa...
- Pituitary Gland: Facts, Function & Disease
- What Are Chinook Winds?
- Photos: The National Monuments Being Targeted by T...
- Rare Treat: 3 Snow Leopards Frolic and Snuggle on ...
- Your Brain Waves May Show Whether You're Paying At...
- Trump Targets US National Monuments in New Executi...
- Ancient Sea Monster with 50 Legs Discovered in Can...
- Wild Snow Leopards Snuggle On-Camera | Video
- Really Micro Machines: Molecular Cars Prep for Fir...
- The Next March Is All About Climate Change
- Facts About Humpback Whales
- Long After Their Bones Were Gone, Neanderthals' DN...
- Photos: Looking for Extinct Humans in Ancient Cave...
- How Long Do Elephants Take to Poop? Same Time As You
- After Vacation, Woman Learns Her 'Rash' Is a Worm ...
- How to 3D Print Glass | Video
- Closest Saturn Pics Yet Snapped During Daring Cass...
- Scientists Can Now Create Glass Figurines with a 3...
- Tropical Storms Create Gamma-Ray Flashes | Video
- Can Bill Nye Really 'Save the World'?
- Hidden World of Canyons and Ridges Revealed on Pol...
- Photos: Gorgeous Landscapes Hidden Beneath Polar Seas
- 'Whispering' Whales: Humpback Calves Speak Softly ...
- Ovaries: Facts, Function & Disease
- Unified Field Theory: Tying It All Together
- Italian Island's Mutation Fights Malaria, But Rais...
- Chronic Fatigue Syndrome Linked with Differences i...
- Humpback Calves Are Close Talkers | Video
- 508-Million-Year-Old Sea Monster Had 50 Legs and G...
- Photos: Ancient Marine Critter Had 50 Legs, 2 Larg...
- Mail Dog: Robotic Dog 'Spot' Could Deliver Your Ne...
- 'Hobbits' May Have Led Early Humans Out of Africa
- Humans May Have Occupied North America 100,000 Yea...
- Pope Urges Solidarity and Compassion in 1st-Ever P...
- In Photos: 130,000-Year-Old Evidence of Humans in ...
- Humans Mastered Advanced Weapon-Making Technique 7...
- 'Almost Forgotten Disease' Caused Factory Workers'...
- Lightning and 'Probably Satellites' Seen from Spac...
- Illegal Pot Use Is Rising in States That Have Lega...
- Nerve Gas Attack: New Treatment Cleared, But More ...
- US Marines Airlifted 1,100 Tortoises to New Desert...
- Did Human Ancestor 'Lucy' Have a Midwife?
- Distant Dwarf Planet DeeDee Stirs Up the Pluto Pla...
- High-Tech Crime Steals the Show in 'Outlaw Tech'
- On Tinder, Swipe Right to Save This Endangered Rhino
- 'Dragonfly' Drone Could Explore Saturn Moon Titan
- Eureka! The Archimedes Principle
- Testicles: Facts, Function & Diseases
- Trademark Style: Why No One's Naming Their Baby Iv...
- Psychedelic Drugs Really Do Trigger a 'Higher' Sta...
- “Outlaw Tech” Trailer: Counterfeiters and High-Tec...
- What Is Exploding Head Syndrome? | Video
- Climate Change Altering the Arctic Faster Than Exp...
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- Earth's Mantle Could Suck Up Carbon from the Air
- Straight Out of 'Star Wars': This 'Death Star' Las...
- Odd New Theory Explains How Early Earth Got Its Ox...
- No Need for Roads: Flying Car Soars Over Water
- Gallery: 5 Times Science Inspired Art
- Did Edvard Munch See 'The Scream' in Spectacular R...
- 'Artificial Womb' Keeps Extremely Premature Lambs ...
- Images of Warming: National Parks in 2050 Posters
- Why Can't You Shake Hands with a Robot?
- Make Mars Livable with Asteroids: Researchers Prop...
- Farewell (for Now) to April's Giraffe Cam
- How Dolphins Do It in Water…with Weird, Complex Ge...
- Extinct Toothy Carnivore Named After Egyptian God ...
- What Your 'Brain Age' Means For Living Longer
- Photoelectric Effect: Explanation & Applications
- Sexual Orientation: Patients More Open Than Docs E...
- Zapping the Brain at Certain Times Improves Memory
- Waddle for Science! Penguins Join Protest March
- Watch Amazing Caterpillars Degrade a Plastic Bag |...
- This Very Hungry Caterpillar Eats Plastic Bags
- An Aurora Called 'Steve'? Strange Sky Phenomenon I...
- Earliest Fungus-Like Fossils Date Back 2.4 Billion...
- Strange Recall: How Do Golf Balls Get into Hash Br...
- What Is Short-Term Memory Loss?
- Gulp! Soda Linked to Memory Woes, Strokes and Deme...
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