Heavy metal first hit the airwaves back in the 1970s and 80s, but many of the elders of metal continue to rock, shred, thrash ...

The periodic table is one of the greatest achievements in scientific history, a tool that has transformed chemistry from an ...

These are almost one-quarter of the periodic table and are mainly found in the first four periods. Of these, 11 are essential elements that our bodies need in larger amounts: oxygen, carbon ...

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