Engineers reinvent the 5,000-year-old gear using fluids instead of solid teeth.

Normally, your body is made of about 50%-60% fluid, including water, blood, and lymphatic fluid. When your fluid levels are out of balance (too high or too low), serious health problems can happen.

Modern cars require a lot of maintenance and individual parts to function properly. Many of those parts degrade over time and require replacement or special attention. Various automotive fluids, in ...

A $1 million prize awaits anyone who can show where the math of fluid flow breaks down. With specially trained AI systems, ...