Fresh aloe vera gel is a miracle worker: soothing sunburns, calming inflammation, and boosting skin hydration. However, its major drawback is its very short shelf life. If you want to harness the ...

An array of powder-metal parts. Powder metallurgy was practiced long before ancient artisans learned to melt and cast iron. Egyptians made iron tools using PM techniques back in 3,000 B.C. The ancient ...