Soft copper wire: 20 gauge (wire diameter 0.8mm): 2 x 14cm (5.5 inch) 28 gauge (wire diameter 0.3mm): 40cm (16 inch) agate stone diameter 12mm You can use a square object with a side of 1cm for easier ...

Weather forecasting is one of the most advanced sciences on Earth. But it’s also one of the most complex and humbling. Here's ...