This is the central equation of quantum theory, and describes how any quantum system will behave, and how its observable qualities are likely to manifest in an experiment.

## Our third and final mini-competition...

This one was pretty simple: we asked you to **tweet a quantum twist on the title of a famous book**. We had loads of great entries - it was hard picking out the top 10, let alone the winner. Even if it was a tough job, we had to do it, so here's our Storify of the top 10:

The winner was Edwin Kirk's brilliant "Do Androids Dream of Electroweak?" Edwin won a year's digital subscription to Scientific American and a book of his choice. He chose Old Man's War by international category judge John Scalzi.

## The winner of our second mini-competition is...

Our second #quantumshorts competition on Twitter was an apportunity to **Ask Artur a Quirky Quantum Question**.

Professor Artur Ekert, the director of CQT, is the co-inventor of quantum cryptography, and he is a fount of knowledge on all aspects of the quantum world.

There were some great questions from curious tweeps. We tried to pick one that was answerable. Here's the winner, about an idea that has inspired many Quantum Shorts stories already:

#quantumshorts Is the existence of parallel universes an essential part of Quantum theory?

— Ivan Kelly (@IvanTheVulcan) Se

ptember 30, 2013

**Professor Artur Ekert's answer:**

*It is not essential for making predictions but the goal of science is not just to make pedestrian predictions but rather to explain the way the world is. In quantum theory, different outcomes happen with different probabilities. The theory accurately predicts these different outcomes and probabilities but does not tell us how one is chosen over another. Supposing that each outcome occurs in its own universe is one solution. The multiverse approach may appear a bit excessive at first but in fact it is the most conservative way to understand quantum theory; it takes its mathematical formalism literally and does not conjure up any arbitrary new rules. It is the simplest explanation we have at the moment. This said, once we take the formalism of quantum theory literally the world turns out to be much richer than our classical intuition had anticipated. Clearly there is much more to physical reality than the universe we see around us.*

In this universe, and possibly many others, @IvanTheVulcan wins a one-year digital subscription to *Scientific American *and a book by one of the judges in our Open International category. Congratulations Ivan!

## And here's what happened in our first competition...

We asked for the **best last line of a quantum-inspired story**. With fewer than 140 characters available, it was a tough ask but we have a worthy winner: Zogg from Betelgeuse, who receives a one year digital subscription to Scientific American and a copy of international category judge Tania Hershman's book of short stories My Mother Was An Upright Piano.

Here's Zogg's winning tweet:

#quantumshorts "Two guards, and we've one arrow left! Impossible!" "No." Young smiled. "We've a double-slit crossbow. Close your eyes..."

— Zogg from Betelgeuse (@ZoggTheAlien) August 19, 2013

We were impressed that Zogg managed to put drama, tension, the observer effect and a classic quantum experiment into one tweet!

There were plenty of other great entries too. Here's a Storify of our top ten:

Make sure you keep up to date with all our competitions by **following CQT (@quantumlah) on Twitter**.