Space.com1dOpinion
Why does everything look flat even though the Earth is round?
Even from space, you wouldn’t detect something important about Earth’s shape: It’s not perfectly round. It’s actually a ...
Smithsonian Magazine2d
These Mysterious 12,000-Year-Old Pebbles May Be Early Evidence of Wheel-Like Tools, Archaeologists Say
Researchers in Israel suggest the roughly donut-shaped artifacts could be spindle whorls, representing one of the oldest ...
Scientific American3d
What’s the Roundest Object in the Universe?
For spinning spheres, centrifugal force is maximized at the equator, where the rotational speed is highest. The amount of the ...
Science Daily3d
12,000-year-old stones may be very early evidence of wheel-like technology
A collection of perforated pebbles from an archaeological site in Israel may be spindle whorls, representing a key milestone in the development of rotational tools including wheels, according to a new ...