Almost everyone knows how a soccer ball looks like – there are several black regular pentagons on it and around each of them – five white regular hexagons. Around each hexagon there are three pentagons and three more hexagons. However, can you figure out how many pentagons and hexagons are there in total on the surface of the ball?

Let the number of pentagons is equal to P and the number of hexagons is equal to H. Then the number of edges is equal to (5P + 6H)/2 – that’s because every pentagon has five edges, every hexagon has 6 edges and every edge belongs to 2 sides. Also, the number of vertices is equal to (5P + 6H)/3 – that’s because every pentagon has five vertices, every hexagon has 6 vertices and every vertex belongs to 3 sides. Now using Euler’s Theorem we get P + H + (5P + 6H)/3 – (5P + 6H)/2 = 2, or equivalently P/6=2 and therefore P = 12. Since around every pentagon there are exactly 5 hexagons and around every hexagon there are exactly 3 pentagons, we get H = 5P/3 = 20. Therefore there are 12 pentagons and 20 hexagons on a soccer ball.


White starts with e2-e4 and the game finishes with a Knight taking Rook mate in the fifth move. Recreate the game.

The game proceeds as follows:

1.e2-e4 Ng8-f6
2.Qd1-e2 Nf6xe4
3.f2-f3 Nd4-g3
4.Qe2xe7 Qd8xe7
5.Ke1-f2 Ng3xh1#


Look carefully at the picture below and answer the questions.

1. How many tourists are staying at this camp?
2. When did they arrive: today or a few days ago?
3. How did they get here?
4. How far away is the closest village?
5. Where does the wind blow: from the north or from the south?
6. What time of day is it?
7. Where did Alex go?
8. Who was on duty yesterday? (Give their name)
9. What day is it today?

1. There are 4 people.
2. They arrived a few days ago, enough so that a spider web can appear on the tent.
3. Judging by the paddles, they got there with boats.
4. There is a hen walking around the camp, so the closest village is not far away.
5. The leaves of the trees are larger at the south side, so the wind must be blowing from the South.
6. The shadow is pointing towards West, so it must be morning.
7. Alex went to catch butterflies.
8. Since Peter is on duty today – cooking food for the group, it was Colin on duty yesterday.
9. Today is August 8. Watermelons ripen in August.


Who says science jokes are not funny? Below you can see some of the best Biology jokes we know, along with short explanations of the more obscure of them.

Do you know any funny Biology jokes yourself? Let us know in the comment section below.

Two blood cells met and fell in love. Alas, it was all in vein.

A clever wordplay with the words “vein” and “vain”.

Pavlov is sitting at a pub, enjoying a pint. Suddenly the phone rings and he jumps up shouting, “Oh no, I forgot to feed the dog!”

Pavlov is a physiologist who used to ring a bell every time he fed his dogs. After some time, he noticed that ringing the bell by its own caused salivation in his dogs, even if he didn’t offer them any food.

“I wish I was adenine, then I could get paired with U.”

In RNA (Ribonucleic acid), adenine (A) makes a “base pair” with uracil (U).

“What did one sister chromatid say to the other?”
“Stop copying me.”

“Sister chromatids” are two identical chromatids (replicated chromosomes), which are joined with each other.

What does DNA stand for? National Dyslexia Association.

Dyslexia is a reading disorder, which causes various troubles during reading, even for people with normal intelligence. If read correctly, the abbreviation for National Dyslexia Association should be NDA, not DNA.

“What did the stimulus do to the neuron after they got married?”
“It carried it over the threshold.”

The “threshold” is the depolarization level over which a stimulus must carry the neuron, in orderΒ for an action potential to be fired.

An infectious disease enters a bar. The bartender says, “We don’t serve your kind here”. The disease replies, “Well, you are not a very good host.”

The word “host” has several meanings, one of which is “a person who accommodates guests”, and another one is “an animal or a plant in which a parasite lives”.

The scientists have just found the gene for shyness. They would have found it earlier, but it was hiding behind two other genes.

“What is the fastest way to determine the sex of a chromosome?”
“Pull down its genes.”

Word play with the words “genes” and “jeans”.

One lab rat says to another:
I’ve got my scientist so well trained that every time I push the buzzer, he brings me a snack.”

“Girl, you are so hot, you denature my proteins.”

When things get hot, proteins denature, i.e. lose their shape and structure.

“What did Gregor Mendel say when he founded genetics?”

Gregor Mendel made his experiments using pea plants.

“What is sleeping brain’s favorite rock band?”

REM stands for “rapid eye movement”, which occurs during sleep.