science

pbs digital studios

pbs

joe hanson

it's okay to be smart

its okay to be smart

it's ok to be smart

its ok to be smart

toilets

poo

poop

feces

excrement

bill gates

melinda gates

bill and melinda gates

shit

crap

history

historical

romans

roman history

toilet history

biology

itsokaytobesmart

joe hanson (person)

health

diarrhea

john snow

thomas crapper

bidet

jon snow

cholera

broad street pump

ancient history (field of study)

middle ages (event)

history (tv genre)

funny

united kingdom (country)

education

learning

chamber pots

river thames

gongfermours

ancient rome

romans

elizabeth i of england (monarch)

john harrington

horrible histories

thomas crapper

bbc

history channel

bathrooms

castles

sewers

ballcock

restrooms

toilet

poop

pooping

poo

shit

crap

flush

bathroom

first toilet

inventor

documentary

history of toilets

ancient toilets

russia

palin

al gore

sarah palin

ceaser salad

penny

batteries

fingernails

shaving

mark olsen

earthworm

bird exploding

great wall of china

420

thomas crapper

metal in microwave

sushi

jelly doughnut

jfk

napoleon

albert einstein

us constitution

declaration of independence

marie antoinette

iron maiden

vikings

hank green

50 common misconceptions

50 misconceptions

trivia

facts

common misconceptions

misconceptions

john green

mental floss on youtube

mental floss