The Soil Beneath Your Feet
YouthAgricultureEcologyEnvironmentNatureYouth 120Youth 125Youth 130Soil is underappreciated. But it's vital in so many ways. Here's a look at the importance of soil - and why soil matters so much.
300 Years of Classical Music in 18 Minutes | Joshua Bell | TED
AdultsHistoryMusicDoes the world still need classical music? What about orchestras? In this gorgeous talk and performance, violinist Joshua Bell and the Chamber Orchestra of America play selections of classical music masterpieces — from Mozart’s Symphony No. 25 to Schubert’s Unfinished Symphony and more — sharing why this art form remains a singularly unifying force.
This is the natural disaster to worry about
AdultsEnvironmentGeologyNatural DisastersThe strange natural material that reshaped the world.
Primitive Technology: 2.5 m Natural draft furnace experiment
AdultsEngineeringExperimentsTechnologyI built a 2.5 m tall furnace to see if it could get hot enough to smelt iron by natural draft alone. Such furnaces work by the stack effect where the tall furnace causes negative pressure inducing an air flow from the base of the furnace and out the top.