a Nigerian invention keeps food fresh without electricity, a large pot inside which fits another smaller pot with a clay lid. The space between the two pots is filled with sand, creating an insulating layer around the inner pot. The sand is then kept damp
In 1927 Professor Parnell heated a sample of pitch and poured it into a glass funnel with a sealed stem. 72 years later, the eighth drop is only just about to fall.
Ferrofluid is a very interesting material originally developed by NASA it has now found itself been used for a whole range of devices including dampers for controlling and stabilizing large building that move around in the wind. It is amazing...