Six STEM Tweets

Six tweets that celebrate engineering and all things STEM.

I scroll so you don’t have to.

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This is issue #72. How many ways is 72 interesting? Let’s see:

• Hafnium is a chemical element with symbol Hf and atomic number 72. Its existence was predicted by Dmitri Mendeleev in 1869, though it was not identified until 1922, by Dirk Coster and George de Hevesy. Hafnium is named after Hafnia, the Latin name for Copenhagen, where it was discovered.

• There’s no country with 72 as the international calling code. ‘7’ is for Russia and ‘7 2’ is a reserved combination.

• 72 is a pronic number - a number that is the product of two consecutive integers, 8 and 9. They are also called oblong numbers and heteromecic numbers.

• 72 the sum of four consecutive primes (13 + 17 + 19 + 23), as well as the sum of six consecutive primes (5 + 7 + 11 + 13 + 17 + 19).

• 72 is the first number that can be expressed as the difference of the squares of primes in just two distinct ways: 11² − 7² = 19² − 17²

• 72 lies between the 8th pair of twin primes (71, 73)

• In typography, a point is 1/72 inch

That’s it for this issue.

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Let’s all celebrate science and engineering and curiosity.

Best wishes,

Harshal