Simple History on MSN

This is how men lived and died - inside U-boats

Life aboard a German U-boat in World War II was brutal, claustrophobic, and deadly. Follow Hans Fischer, a young mechanic ...
Hosted on MSN

Helicopters don’t need engines to stay in the air. Here’s the science.

A powerless helicopter doesn’t drop—it autorotates, gliding like a maple seed. This breakdown explains how that works, why gyro boats and WWII U-boat rotor kites flew without engines, and how some ...