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Wednesday, September 15, 2010

How does a lightning form? And how does it behave?


These two questions are hard to answer because the lightning happens so fast that we see just a blinding light coming from the sky followed by a deafening thunder.
What, in ancient times, was considered divine powers, today is explained and detailed observed with help of science.
This video shows a slow motion lighting behavior.
We can see the three kinds of lightning: cloud to the ground, ground to the cloud and cloud to cloud.
Is also possible to see how the discharge follows the ionized air of the previous discharge.

Slow Motion ligthning

By: Marcus Saraiva on: 6:33 AM

Friday, August 13, 2010




When two materials are rubbed a kind of effect appears, they become charged. The polarity (what material will become positive and what will become negative) is given by the triboelectric series.
Usually, physics teachers use a pipe and a cat or rabbit hide to demonstrate this effect. This video shows how a children playing on a plastic slide can generate static electricity.
Both, children and slide become charged and that can be noted because the children’s hairs stand on end.

Triboelectricity - Children playing on a Plastic slide

By: Marcus Saraiva on: 1:44 PM

Friday, March 12, 2010






This video shows simple science tricks that can be used to amuse friends in a party, play with children or even in a science fair.
I wish you enjoy it.

The best science tricks for parties, at least a geek party!

By: Marcus Saraiva on: 4:01 PM

Thursday, February 18, 2010




Square bubbles sounds impossible, ours brains connect the word bubble with the spherical shape. However this video shows how to produce square bubbles using a science trick.

Steve Spangler teaches how to make square bubbles

By: Marcus Saraiva on: 3:55 AM

Tuesday, February 2, 2010


Flutter Effect is a self-feeding mechanism in which aerodynamic forces on a object (This case an airplane wing) are coupled with the natural mode of vibration of this object to produce a periodic and, sometimes, destructive motion.

Flutter Effect - Dynamic Aeroelasticity

By: Marcus Saraiva on: 2:24 PM

Thursday, January 28, 2010


This video shows a pumpkins cannon. It uses compressed air to accelerates the pumpkins through out a long pipe. As bigger the pipe, more time the pumpkin is accelerated, so higher is the inicial velocity. At a 45 degress angle the pumpkin reach the maximum horizontal distance.

Lets pump...pumpkins

By: Marcus Saraiva on: 2:51 AM

Wednesday, January 27, 2010


This video shows how to do it and how it is possible

Drop a egg from 2 meter high without break it

By: Marcus Saraiva on: 9:53 AM

Nitrocellulose, an explosive similar to nitroglicerin but, instead of glicerin, it has cellulosis on its composition. It is not sensitive to impact just to heat.
It burns so fast that there is no time to exchange heat with the hand

Nitrocellulose - the gun cotton

By: Marcus Saraiva on: 9:33 AM

This tick uses the pascal principle to break up the bottom of a bottle! You'll need some practice to do that. Warning, the broken glass can be very dangerous!

Pascal Principle bracks the bottle

By: Marcus Saraiva on: 8:35 AM

This video shows how to make ferrofluid using household materials

Make ferrofluid using household materials

By: Marcus Saraiva on: 6:47 AM

Tuesday, January 26, 2010


This video shows how to play tennis using a soap bubbles and a carpet racket. The soap bubbles are formed by a doubled layer of soap at extremities and a layer of water at center.
The polar part of soap molecules are bonded to the water and the nonpolar part are on the outer side.
Carpet is composed of polyester, as the bubble's outer side, so the interaction between them is very weak and the bubble do not pop out.

How to Play tennis using soap bubbles and a carpet racket

By: Marcus Saraiva on: 1:45 PM

Monday, January 25, 2010


Each chemical element has its own Identity given by the color emited when it is burning. The colors in fireworks is due a diferent kind of elements. Copper give the color green, sodium give the yellow one. This video shows a lot of diferent elements and its correspondent colors.

Flame test as you never seen before

By: Marcus Saraiva on: 12:01 PM

Glycerine or glicerol is oxidized by a very powerfull oxidant, the potassium permanganete. This reaction liberates a lot of heat, it's called exothermic reaction.

Oxydation of glycerine by potassium permanganate

By: Marcus Saraiva on: 11:53 AM

Learn about science and you make your own butter. Science has never tasted so good.

Science experiment - how to make butter

By: Marcus Saraiva on: 11:47 AM

"Innovative technology often can make yesterday's science fiction into today's reality. This is particularly true with a prosthetic hand that brings to life fictional accounts of artificial, computer-driven replacement body parts. The bionic hand, called the I-Limb,was named one of the top 50 inventions this year by Time Magazine." From youtube description

Bionic Hand is a Reality

By: Marcus Saraiva on: 11:43 AM

Robots at third Austrian Hexapod Championships: Category Dance. The best of 2009!

Best of Dance 2009 - Austrian Hexapod Championships

By: Marcus Saraiva on: 11:40 AM

 

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