Carbonate of this element is the active ingredient in Tums, which can be used to treat a deficiency of it
Calcium
Biologically speaking, it's what the N-A stands for in RNA and DNA
Nucleic acid
This Kenyan metropolis outdoes Denver by a few hundred feet in the 'Mile High Capital City Club'
Nairobi
Frequently uttered by Stan and Kyle on "South Park": "Oh My God", these three words
They killed Kenny
You can breathe easy knowing photosynthesis causes plants to release this gas as a waste product
Oxygen
Drugs like Claritin work by reducing the effects of this natural chemical in the body
Histamine
sec is short for this trigonometry function
Secant
It was the capital of Gran Colombia before it was the capital of (regular) Colombia
Bogota
Casting about for a line to go along with snuffing out a torch on "Survivor", executive producer Mark Burnett came up with this one
The tribe has spoken
This element's "footprint" is everywhere: by definition, every compound studied by organic chemists contains it
Carbon
Before penicillin, bacterial infections were treated with these 5-letter drugs that are still used for eye infections and acne
Sulfa
C is short for this unit of electric charge, named for a French physicist
Coulomb
This capital of Cambodia is at the junction of the Mekong and the Tonle Sap
Phnom Penh
Seinfeld greeted the neighbor played by Wayne Knight with scorn and these two words
Hello, Newman
Triglycerides are the most common type of this organic compound; healthy eaters steer clear of the saturated ones
Fats
The sedative Diazepam began being sold under this name in 1963; a few years later, it was "mother's little helper"
Valium
If you're a web developer, you probably use HTML (hypertext markup language) and CSS, short for this
Cascading Style Sheets
It's not just the capital-- it's also one of Morocco's four imperial cities
Rabat
"Did I do that?" was this character's mantra on "Family Matters"
Steve Urkel
In chemistry, it's the unit of measure equal to 6.02x1023 of anything-- atoms, molecules... even mammals that burrow in your lawn
Mole
It's the active ingredient in the "pens" used to treat anaphylaxis
Epinephrine
PTX can be short for this condition of air in the pleural space
Pneumothorax
Climbing up on Medvednica Hill, I could see this end-of-the-alphabet city's light and pictured its 13th century invasion by Mongols
Zagreb
The 1960s series "Lost In Space" gave us this three word catchphrase; it was an episode title of the 2018 reboot
Danger, Will Robinson
Chemically speaking, they're molecules with at least one unpaired electron; true to their name, they can be, like, totally reactive
Radicals/ free radicals