This Austrian monk found pairs of genes separate in a random fashion when a plant's gametes form
Mendel
Inhaling some of this second-lightest element makes your voice sound all funny
Helium
1 + 2 + 3 + 4 + 5
15
A class in school, or a record of where you've gone in a web browser
History
There's no defense for not knowing this term for a 5-sided polygon
Pentagon
Surely this rings a bell: the name of this physiologist who studied the secretory activity of digestion from 1890 to 1900
Pavlov
Look what happens when a strong, healthy bone is soaked in vinegar; the acidic acid dissolves this key element, atomic No. 20; without it, the bone becomes soft & weak
Calcium
1 - 2 + 3 - 4 + 5
3
A single processor sharing multiple jobs is doing this, like when Mom tries to drive & put on makeup
Multitasking
Euclid came up with the first proof that there are an infinite number of these integers with only 2 positive divisors
Prime numbers
This Swede's original scale had water's boiling point at 0 degrees & its freezing point at 100
Celsius
In an idiom something that fails to arouse any interest is said to "go over like a" balloon made of this metal
Lead
1 x 2 x 3 x 4 x 5
120
Before a game's release, Joe Gamer may be asked to play a pre-version usually referred to by this Greek letter
Beta
His Theorem helps you find the hypotenuse
Pythagoras
This giant of modern physics was diagnosed with ALS as a graduate student at Cambridge
Stephen Hawking
"God bless" this radioactive element, atomic No. 95, that was first produced by a team of U.S. chemists in 1944
Americium
-1 x 2 x -3 x 4 x -5
-120
You may have worked with a newfangled cash register called a POS terminal, the POS standing for this
Point of Sale
This trigonometric function uses the opposite and adjacent sides
Tangent
This Rome-born physicist designed the first nuclear reactor
Enrico Fermi
Alphabetically, it's the first chemical element to have a single-letter symbol
Boron
12+34+5
87
imgur.com has a button to make this four-letter cultural reference that often spreads online
Meme
In Cartesian geometry, the y coordinate of a point is called this
Ordinate