A long-simmering disagreement over the universe’s present-day expansion rate shows no signs of resolution, leaving experts ...

Could the universe be rotating at an imperceptible speed? An extremely slow rotation, occurring once every 500 billion years, ...

As strange and unique as the laws of the quantum realm appear in our everyday experience, every now and then experiments ...

Demonstrates basic principles of water, including surface tension, pressure, and buoyancy. It shows how water can hold more than its brim due to surface tension, how pressure increases with depth ...