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...
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