NOVA

自然 · 历史

S27 E11 Diamond Deception

本集简介

Makeshift labs in China and Russia are turning out synthetic gemstones that rival natural diamonds.

上一集

2000/02/01 S27 E10

Secrets of Lost Empires: Medieval Siege

Two teams set out to build precise replicas of a fearsome medieval weapon—the trebuchet.

下一集

2000/02/08 S27 E12

Secrets of Lost Empires: Pharaoh's Obelisk

Experts take on the challenge of raising a 40-ton obelisk without using modern technology.

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