There are many small gadgets that require a cell battery in order to operate. However, here four useful gadgets that only ...

Cymatics shows how sound vibrations shape matter. Vibrating surfaces make particles like chalk form geometric patterns, ...

Thank you for completing the survey. Click the links below to download your 2014 European Radio Frequency Allocations Charts. Charts Include: 3-3000 kHz, 3-30 MHz, 30-3000 MHz, 3-30 GHz and 30-300 ...

NIST-F4 measures an unchanging frequency in the heart of cesium atoms, the internationally agreed-upon basis for defining the second since 1967. The clock is based on a "fountain" design that ...