Category: Here’s the Science
Cosmos 1: The First Solar Sail
Cosmos 1: The First Solar Sail
“IN JUST A FEW WEEKS THE WORLD’S FIRST SOLAR SAIL SPACECRAFT WILL BE LAUNCHED BY OUR PLANETARY SOCIETY LED TEAM”
PhysOrg: Research team recreates ancient underwater concrete technology
PhysOrg: Research team recreates ancient underwater concrete technology
This is way cool! I thought that there was more to concrete than lime sand and agrigrate. Got a book from 1920 something on farm concrete that I need to check and see what it says. Seems like they use portland in it though. Wonder if the seawater has something to do with the process?