### Trivia

Hard

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

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

Hard

In The 1980s There Was A Brief But Active Trend In Comic Books Portraying?

### Trivia

Hard

Gummy Bears Were Invented In?

### Trivia

Very Hard

Which Of These Halloween Movies Was Critically Panned, But Became A Cult Classic?

### Trivia

Easy

Which Animal’s Name Means “Person Of The Forest”?

### Trivia

Hard

What Was The First Instant Messaging App?

### Trivia

Hard

The “Ye” In Archaic Names Like “Ye Olde Shoppe” Is Derived From A Middle English Symbol Called A?

### Trivia

Hard

Which TV Show Was Resurrected By Brisk DVD Sales?

### Trivia

Hard

Modern Arcade Games Evolved From Which Unlikely Ancestor?

### Trivia

Hard

The Venus Fly Trap Is Found Natively Only In Which Region Of The World?

### Trivia

Easy

What Popular Sci-Fi Book Began Life As A Radio Show?