51动漫

(Original Caption) 7/5/1946-The roller coaster is a rough ride, but do they love it! This unposed photo was taken by the intrepid photographer from a front seat, as the car made a stomach-dropping descent. A companion clutched the camera while he clicked the shutter. ACME ROTO SERVICE FOR IMMEDIATE RELEASE BPA 2 #124

Why do we scream in fear? part 2

There is a mathematical equation that can help explain the benefits of screaming, says one reader

INDIA. Bangalore. 2016. Laughing Yoga workshop participant Rie Sakamoto

This week鈥檚 new questions

PGRFBG beautiful exoplanet, part of an alien binary star system with a red and blue star (3d space illustration)

Can a planet orbit a binary star system in a figure of eight?

(Original Caption) 7/5/1946-The roller coaster is a rough ride, but do they love it! This unposed photo was taken by the intrepid photographer from a front seat, as the car made a stomach-dropping descent. A companion clutched the camera while he clicked the shutter. ACME ROTO SERVICE FOR IMMEDIATE RELEASE BPA 2 #124

Why do we scream in fear?

3BHN5M7 A woman holds a sign that reads Greed is not a virtue during a protest across the street from Florida Congresswoman Maria Elvira Salazar's Office.

What good is greed? part 2

Cute toddler and a baby girl having a play date in the park

This week鈥檚 new questions

This sequence of artist's illustrations shows how a black hole can devour a bypassing star. 1. A normal star passes near a supermassive black hole in the center of a galaxy. 2. The star's outer gasses are pulled into the black hole's gravitational fie

Do black holes look doughnut-shaped when viewed in all directions?

3BHN5M7 A woman holds a sign that reads Greed is not a virtue during a protest across the street from Florida Congresswoman Maria Elvira Salazar's Office.

What is the evolutionary basis for greed?

This week鈥檚 new questions

Planet in water - Moon. Science fiction art. Solar system. Elements of this image furnished by NASA; Shutterstock ID 579784837; purchase_order: -; job: -; client: -; other:

If all Earth鈥檚 water were put in a ball, how large would it be?

The answer is a bit under 1400 kilometres in diameter, and no, say our readers

I’m in an arid desert with some caffeinated coffee. Should I drink it?

What are the pros and cons of using carbon dioxide in tyres? part 2

How do you get the most clothes into a suitcase? part 2

This week鈥檚 new questions