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# Amazing / Strange Things Scientists Calculated in 2021

fahrbot-bot writes: The world is full of beautiful equations, numbers and calculations. From counting beads as toddlers to managing finances as adults, we use math every day. But scientists often go beyond these quotidian forms of counting, to measure, weigh and tally far stranger things in the universe. From the number of bubbles in a typical glass of beer to the weight of all the coronavirus particles circulating in the world, LiveScience notes the 10 weird things scientists calculated in 2021.
Number of bubbles in a half-pint glass of beer: up to 2 million bubbles, about twice as many as Champagne. Weight of all SARS-CoV-2 particles: between 0.22 and 22 pounds (0.1 and 10 kilograms).Counted African elephants from space for the first time -- Earth elephants (using satellites and AI) not Space Elephants.Acceleration of a finger snap: maximal rotational velocities of 7,800 deg/s and a maximal rotational acceleration of 1.6 million deg/s squared -- in seven milliseconds, more than 20 times faster than the blink of an eye, which takes more than 150 milliseconds.Calculated pi to 62.8 trillion decimal places.Updated the "friendship paradox" equations.Theoretical number and mass of all Black Holes: about 1% of all ordinary matter (not dark matter) in the universe.How long would it take to walk around the moon? At 4 hours a day, it would take about 547 Earth days, or about 1.5 years.How many active satellites currently orbit the planet? As of September 2021, there were around 7,500 active satellites in low Earth orbit.The "absolute limit" on the human life span: probably 120 to 150 years.