(via philossofos)

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fuckyeahexistentialism:

itstactical:

Here are some resources we’ve gathered so far.

• Looking for a runner? Use this form.
• If you’re trying to call someone in Boston, phone lines are jammed. SMS, Twitter, and Facebook might work better. [Lifehacker]
• Live news updates on The Verge
• Reconnect with loved ones in Boston on Red Cross Safe and Well
• Donate blood at the Boston American Red Cross

(via thelittlestpadawan)

tarzanekingoffemales:

Do NOT drive through Boston or take the subway right now. The emergency radio is buzzing with more possible bombs. Please spread this everywhere you can to let your friends and family members know. It could save a life.

(via thelittlestpadawan)

trilliansthoughts:

This miniature ecosystem has been thriving in an almost completely isolated state for more than forty years. It has been watered just once in that time.

The original single spiderwort plant has grown and multiplied, putting out seedlings. As it has access to light, it continues to photosynthesize. The water builds up on the inside of the bottle and then rains back down on the plants in a miniature version of the water cycle.

As leaves die, they fall off and rot at the bottom producing the carbon dioxide and nutrients required for more plants to grow.

(via tentaclesandteacups)

Stalker - Andrei Tarkovsky

(via fuckyeahexistentialism)

(via fuckyeahexistentialism)

sciencenote:

In 1202, Italian mathematician Leonardo Pisano (also known as Fibonacci, meaning “son of Bonacci”) pondered the question: Given optimal conditions, how many pairs of rabbits can be produced from a single pair of rabbits in one year? This thought experiment dictates that the female rabbits always give birth to pairs, and each pair consists of one male and one female.

­Think about it — two newborn rabbits are placed in a fenced-in yard and left to, well, breed like rabbits. Rabbits can’t reproduce until they a­re at least one month old, so for the first month, only one pair remains. At the end of the second month, the female gives birth, leaving two pairs of rabbits. When month three rolls around, the original pair of rabbits produce yet another pair of newborns while their earlier offspring grow to adulthood. This leaves three pairs of rabbit, two of which will give birth to two more pairs the following month.

The order goes as follows: 1, 1, 2, 3, 5, 8, 13, 21, 34, 55, 89, 144 and on to infinity. Each number is the sum of the previous two. This series of numbers is known as the Fibonacci numbers or the Fibonacci sequence. The ratio between the numbers (1.618034) is frequently called the golden ratio or golden number.

At first glance, Fibonacci’s experiment might seem to offer little beyond the world of speculative rabbit breeding. But the sequence frequently appears in the natural world — a fact that has intrigued scientists for centuries.

(via sciencenote)

bhagatkapil:

Science Day in India, posting whole series of Scientists, their inventions or discoveries.

(via fuckyeahmath)

1ucasvb:

The familiar trigonometric functions can be geometrically derived from a circle.

But what if, instead of the circle, we used a regular polygon?

In this animation, we see what the “polygonal sine” looks like for the square and the hexagon. The polygon is such that the inscribed circle has radius 1.

We’ll keep using the angle from the x-axis as the function’s input, instead of the distance along the shape’s boundary. (These are only the same value in the case of a unit circle!) This is why the square does not trace a straight diagonal line, as you might expect, but a segment of the tangent function. In other words, the speed of the dot around the polygon is not constant anymore, but the angle the dot makes changes at a constant rate.

Since these polygons are not perfectly symmetrical like the circle, the function will depend on the orientation of the polygon.

More on this subject and derivations of the functions can be found in this other post

Now you can also listen to what these waves sound like.

This technique is general for any polar curve. Here’s a heart’s sine function, for instance

(via fuckyeahmath)