Instructional Video2:56
Curated Video

Ordnance Survey Maps

6th - 12th
Ordnance Survey has been creating maps for hundreds of years. How have their mapping methods changed since the first Ordnance Survey maps were made? Human Geography - Orientation And Settlements - Learning Points. The British Ordnance...
Instructional Video1:43
Tom Scott

The Concrete Pillars On Top Of British Hills: Trig Points

9th - 11th
http://tomscott.com - http://twitter.com/tomscott - Around the United Kingdom there are odd concrete pillars on the top of hills, built to last for decades if not centuries. They've got a cryptic marking on them, and the words "Ordnance...