If true, the following conjecture of Thomassen [Th81] is a planarity criterion for a special class of graphs that involves only K 5. Recall that a planar graph on n vertices contains at most 3n-6 ...

Duplicates of crystal structures are flooding databases, implicating repositories hosting organic, inorganic, and computer-generated crystals. While some database administrators are mum about ...

Adam Hayes, Ph.D., CFA, is a financial writer with 15+ years Wall Street experience as a derivatives trader. Besides his extensive derivative trading expertise, Adam is an expert in economics and ...

1959 Kīlauea Iki eruption: It happened in the crater just north of the volcano’s caldera, lasting only about a month with 17 ...

If you had a reputation for being a know-it-all as a kid, you’re likely now the person with a trusted list of trivia questions and answers on file. Not only that, but you probably love sentences that ...

1. Would you rather be able to fly or be able to breathe underwater? 2. Would you rather your crush be able to read your mind or have access to your internet history? 3. Would you rather swim in the ...

The festive season is here, so you know what that means: it's party time! We've got just what you need to start up the conversation and get everyone in the mood. Whether you're playing Never Have I ...

Trigonometric graphs can be sketched when you know the amplitude, period, phase and maximum and minimum turning points. Learn about graphs of trigonometric functions in this National 5 Maths guide.

Cardiovascular disease is a term used to describe diseases of the heart and blood vessels. Some of the common types of cardiovascular disease include coronary artery disease, heart attack, and heart ...

Every pub quiz needs a sport round, and we're on hand to provide you with a range of questions to bamboozle your friends and family. We've compiled a list of tricky sports quiz questions for you to ...

Fancy putting your musical know-how to the test – or giving your mates and relatives a proper challenge? You’ve come to the right place. We’ve put together a stash of brain-teasing music questions, ...