Metals have a crystal structure. But they're not one big crystal, they're lots of small crystals called grains. The size of the grains affects the physical properties of the metal, like hardness, toughness,... continue reading

posted by newtboy 3 years 5 months ago • 135 views • 8:45

I built a water powered hammer called a “Monjolo”. I started by making a water spout from half a hollow log to direct water from the creek. This was set up in the creek and water flowed through it.... continue reading

posted by Joe Motion (lurgee) 7 years 10 months 2 weeks ago • 1,217 views • 8:51

Cooking and leaching Black bean to remove the poison making it safe to eat. A basket was made to leach the poison out in a stream. Also shown are Atherton Oak nuts. The Aboriginal artifacts found near... continue reading

posted by Mordhaus 8 years 9 months 2 weeks ago • 300 views • 4:51

Shaking grains and interesting physics.

posted by Skeeve 1 decade 3 years 6 months 1 week ago • 961 views • 9:52