by Howard Covitz
The astrolabe is an astronomical calculator dating back at least 2000 years. Once you have walked through how to use the darn thing, you will appreciate firsthand just how much ""they knew back then"".
Why is math cool?
My transgender experiment
Mapping the sky
21st Century Teachers
To Be A Great Leader, Perform Burlesque
Ignite Chisinau: After Hours. Viorica Nagacevschi (Aprilie 2017)