Every big idea in science,
one card at a time.
Free, plain-language explanations of the key ideas in math, physics, chemistry and biology, course by course. Every idea is also a collectible card, and a card game you can only win by using the science right.
1 · Read it free
Each idea gets one page: what it is, why it works, what it lets you predict, and how tests ask about it.2 · Collect it
Starter decks and booster packs. Common, rare and legendary cards; element cards are as rare as the element is on Earth.3 · Play it
In Lab Duel you win a challenge by playing the right idea and explaining it in one sentence.Pick a subject
Card of the week
Biology◆ Rare
Photosynthesis
Fotosyntes
Discovered 1779 · Jan IngenhouszEUREKA 10
Photosynthesis
Photosynthesis. Plants use light to build sugar from carbon dioxide and water, and give off oxygen.
The surprise: Most of a tree's mass comes from the air.
Try before you buy
Print a free sample card and a challenge, and play a round with a friend: printable sample.
All prototype cards
Math◆ Rare
Pythagoras' theorem
Pythagoras sats
Discovered 1800 BC · BabylonEUREKA 01
Pythagoras' theorem
Math● Common
Percent change
Förändringsfaktor
Discovered 14 · Roman taxesEUREKA 02
Percent change
Physics★ Legendary
Newton's second law
Newtons andra lag
Discovered 1687 · Isaac NewtonEUREKA 03
Newton's second law
Physics◆ Rare
Energy conservation
Energiprincipen
Discovered 1847 · Mayer and JouleEUREKA 04
Energy conservation
Physics● Common
Ohm's law
Ohms lag
Discovered 1827 · Georg OhmEUREKA 05
Ohm's law
Chemistry● Common
Density
Densitet
Discovered 250 BC · ArchimedesEUREKA 06
Density
Chemistry● Common
Oxygen
Syre
Discovered 1772 · C. W. ScheeleEUREKA 07
Oxygen
Chemistry★ Legendary
Gold
Guld
Discovered 4500 BC · Varna, BulgariaEUREKA 08
Gold
Biology★ Legendary
DNA
DNA
Discovered 1953 · Franklin, Watson, CrickEUREKA 09
DNA
Biology◆ Rare
Photosynthesis
Fotosyntes
Discovered 1779 · Jan IngenhouszEUREKA 10
Photosynthesis