### Trivia

Hard

In Your Average School Class There Is A 50% Chance Two People Share What?

Great-Great-Great Cousins
A Birthday
Ear Wax Type
Blood Type

In the field of probability theory, there is a problem known as the Birthday Paradox concerning the probability that in a selection of N randomly chosen people, some of them will share a birthday. This probability reaches 100 percent once you reach a sample size of 367 people (to account for the 366 potential days, including Feb. 29th, +1).

What’s fascinating, however, is how quickly the probability of sharing a birthday climbs. In a group of 23 people, around the size of a small class, the chances of two people sharing a birthday have already climbed to 50 percent. To get to 99 percent, you’d just need to gather two classrooms together. In a group of 57 people, there is a 99 percent chance that there is a common birthday.

While this might seem like something of a mathematical parlor trick, the math behind the Birthday Paradox has actually been successfully employed as a well known cryptographic attack, the Birthday Attack, which uses probabilistic modeling to reduce the complexity of cracking encryption hash functions.

### Trivia

Easy

The Longest Running Scientific Experiment Centers Around What?

### Trivia

Very Hard

For Centuries Wine Was Flavored With What Toxic Compound?

### Trivia

Hard

What Was The First Rover To Land On A Celestial Body?

### Trivia

Hard

The Largest Terrestrial Biome On Earth Is The?

### Trivia

Easy

Which Simpsons Character Was Originally Intended As Homer’s Secret Identity?

### Trivia

Easy

Which Product Name Is A Clever Anagram Of What They Supply?

### Trivia

Hard

The Code Name For Microsoft Encarta Was?

### Trivia

Very Hard

Which Empire Ruled Over The Largest Percentage Of Earth’s Population?

### Trivia

Hard

The Ubiquitous Black Pens Found At Post Office Buildings Are Manufactured By?

### Trivia

Hard

Which Of These Sweet Treats Was Originally Made From Sap?