A lab scientist wearing a coverall protective suit holding a test tube labeled VIRUS
Biology

Bioterrorist Attacks: A Brief History

September 16, 2021

Before Americans had a chance to fully grasp the reality of the 9/11 terrorist attacks, merely a week later, deadly envelopes were sent to people around the country with anthrax bacteria inside them. […]

The position of fluorine in the periodic table.
Chemistry

Completing Mendeleev’s Periodic Table

August 22, 2021

The periodic table had clear gaps that required predictions, and many of those predictions were filled when new elements predicted by Mendeleev were subsequently discovered. […]

An image of pure antimony.
Chemistry

The Concept of Chemical Elements

August 22, 2021

Throughout the 18th and 19th centuries, chemists identified more and more new chemical elements, adding to the dozen or so elements that had been known to the ancients. […]

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