or log in
How to rotate a pinwheel and a spiral without touching them.
Candles have been used for lighting since ancient times.
A type of rotary engine of high efficiency
Is there a difference between the weight of a plastic bottle filled with air and the weight of a...
How can a tin can be crushed without manual force? All you need is some water and heat.
Among the most significant research carried out in the early 20th century focused on the...
The German engineer Rudolf Diesel patented the diesel engine in 1893.
Stirling engines are also known as external combustion engines. Unlike internal...