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Sharing 9 videos about limestone

Spain’s crystal cave, the giant gypsum geode of Pulpí

Rion NakayaMay 10, 2022June 9, 2022

Gems, Minerals, Crystals, and Rocks: What’s the Difference?

Rion NakayaApril 27, 2022May 10, 2022

What are rocks and how do they form?

Rion NakayaMarch 15, 2022

The Pyramids of Giza, a 2-hour (mostly) slow TV walking tour

Rion NakayaOctober 21, 2021October 21, 2021

How Were the Pyramids Built?

Rion NakayaMay 13, 2019

The Problem with Concrete

Rion NakayaMarch 4, 2019May 23, 2019

Making lime with Primitive Technology

Rion NakayaMarch 7, 2018October 23, 2018

Underwater Caves of the Yucatán Peninsula, a Wonders of Life clip

Rion NakayaJuly 22, 2015April 23, 2021

The Great Pyramid of Giza was bright white & highly polished

Rion NakayaOctober 29, 2014May 13, 2019