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The world of fractals

A fractal is a mathematical set that has a fractal dimension that usually exceeds its topological dimension and may fall between the integers. Fractals are typically self-similar patterns, where self-similar means they are the same from near as from far\\\". More »

Funny science

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TEDx Cambridge School of Bucharest

How I Passed Chemistry - Tedx Cambridge School Of Bucharest - April 3, 2015 More »

Leadership Authentic Summer Camp

I had a great time together with 26 great students that came from all over the cuntry - Casa Vlasia, Snagov - August 3, 2015 More »

Becoming a volunteer at the orphanage

Training - Bucharest - February 15, 2015 More »

 

Monthly Archives: July 2016

How I Passed Chemistry – Ana Ispasoiu – TEDx Cambridge School of Bucharest

How I Passed Chemistry – Ana Ispasoiu – TEDx Cambridge School of Bucharest

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Can We Create Artificial Gravity?

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Are Your Summer Clothes Good Enough To Be Sun Protective Clothing?

Did you know that the sun’s UV rays can go through right your clothes? Damaging rays can pass directly through the fabric fibers as well as between them. One-third of what you plan to wear this summer will not protect you from sun. You’ll tan, burn, and get sun damage UNDER your cloths. Understanding how to use clothing for sun protection will save you on sunscreen, provide you with convenient sun protection, actually keep you cool and it can even be a fashion statement if you do it right.

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First, the bad news about your clothes:

  • One-third of summer clothes are lousy at sun protecting skin. This is especially true for lightweight, thin fabric made of cotton, linen and rayon.
  • The best sun protection comes from fabric you’re not likely to wear in the summer like thick and tightly woven fabric, dark colors, polyester, nylon and wool.
  • Wet, stretched fabric provides poor sun protection (think wet white cotton tee shirt). Interestingly, a dark tee shirt will probably provide more protection than a light-colored one because the color alone also helps absorb UV rays.
  • Fuzzy, new, unbleached cotton sometimes provides good sun protection when it’s dry, but UV rays can pass through cotton fibers.

I see sun exposure, sun damage and skin cancers on the backs of people who do not directly expose their skin to the sun, especially after summer. I can only assume the problem is sun coming through their shirts. Now, the good news: It’s easy to buy or make sun protective clothing! You can buy sun protective clothing from companies like REI, Sun Precautions, Coolibar etc. The styles are pretty generic, but the garments often contain hidden vents, zippers that open for ventilation and other clever tricks to keep you cool in sunny, hot places. (Think tropical vacation, hiking in the sun, gardening, cycling, etc.) The big surprise — You can make sun protective clothing out of what’s already in your closet using a product called Sun Guard. For $4 you treat an entire load of laundry, saving serious money and giving you fashion control.

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NASA History

neptun

French astronomer Alexis Bouvard published astronomical tables of the orbit of Uranus in 1821. This table made predictions of the future positions of the planet based on Newton’s law of motion and gravitation. However, Uranus did not follow this predicted orbit, causing Bouvard to hypothesize that there was some other body causing the perturbation. A young University of Cambridge student, John Couch Adams had become convinced of the “perturbation” theory. On July 3, 1841, he noted his intention to work on the problem. Adams was convinced that he could deduce the mass, position, and orbit of the perturbing body using just Uranus’s observed data and Newton’s law of gravitation. He began his calculations in 1843 and completed 6 iterations of the problem while tutoring undergraduates and teaching his servant how to read.

Another mathematician in France, Urbain Le Verrier, was also investigating the same problem. He made his final prediction of the position of the perturbing planet to the public on August 31, 1846, two days before Adam’s final solution was mailed to the Royal Greenwich Observatory. Le Verrier sent his own observations to J.G. Galle at the Berlin Observatory. On Sept 23 of the same year, the planet Neptune was found within 1 degree of the predicted location. Controversy erupted between Britain and France as to who was first to make the prediction. However, Adams publicly acknowledged that Le Verrier deserved the honors of the discovery, because his prediction led to the actual planetary discovery by Dr. Galle.

Source: NASA History

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