3,981 results
3,981 results for:
- Life
Stem cell advance uses cloning
A method that uses eggs to do genetic reprogramming is successful in humans.
- Materials Science
To make bronze, tin flakes do a wild dance
Upsetting some prevailing ideas about how alloys form, rafts of tin atoms jitterbug madly around on a pure copper surface and leave spots of bronze in their wakes.
- Math
Prime proof zeros in on crucial numbers
A new theorem may lead to a proof of Catalan's conjecture, a venerable problem in number theory concerning consecutive powers of whole numbers.
- Health & Medicine
Vitaminlike compound eases rare disorder
A vitaminlike substance called coenzyme Q10 helps people with familial cerebellar ataxia, a hereditary disorder that damages the spine and the part of the brain responsible for coordination.
- Math
Golden Blossoms, Pi Flowers
In the head of a sunflower, the tiny florets that turn into seeds are typically arranged in two intersecting families of spirals, one winding clockwise and the other winding counterclockwise. Count the number of florets along a spiral and you are likely to find 21, 34, 55, 89, or 144. Indeed, if 34 floret (or […]
- Math
A Geometric Superformula
The notion of a simple equation that you can use to generate a wide variety of geometric shapes is an immensely appealing one. Johan Gielis of Antwerp, Belgium, proposes one such formula in the March American Journal of Botany. “Many geometrical forms, both in nature and culture, can be interpreted as modified circles,” Gielis states. […]
- Math
Goldbach Computations
In 1742, historian and mathematician Christian Goldbach (1690–1764) wrote a letter to Leonhard Euler (1707–1783) in which he suggested, in effect, that every integer greater than 5 is the sum of three prime numbers. A prime number is evenly divisible only by itself and 1. Nowadays, Goldbach’s conjecture is expressed in the following equivalent form: […]
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- Math
Hiding in DNA
Spies might have to start boning up on molecular biology to pass along and decipher secret messages. During World War II, German spies used microdots to hide information in plain view. Consisting of a greatly reduced photograph of a typed page, a microdot could be pasted on top of a printed period at the end […]
- Math
Hiding in DNA
Spies might have to start boning up on molecular biology to pass along and decipher secret messages. During World War II, German spies used microdots to hide information in plain view. Consisting of a greatly reduced photograph of a typed page, a microdot could be pasted on top of a printed period at the end […]
- Math
Completing Latin Squares
Using only the numbers 1, 2, 3, and 4, arrange four sets of these numbers into a four-by-four array so that no column or row contains the same two numbers. The result is known as a Latin square. Here are two examples of Latin squares of order 4: 1 2 3 4 2 1 4 […]
