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Why is public WI-FI more risky

Public WI-Fi hotspots, such as those offered by cafes and hotels, don't require any authentication when you connect to them. This makes it relatively easy for anyone with the right technological know-how to access the data stored on your connected device.


For example, they could intercept the connection and gain access to anything you send via the internet, including emails and money transaction, or they could use the network to plant infected software, called malware, onto your device.

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Does more body fat make you more cold resistant?

Body fat is a good insulating material because it's a poor conductor of heat. This means that warmth generated in the body will be lost to the outside environment more slowly in people with higher body fat. However, people with high body fat may sometimes fell colder than individuals with lower body fat, as their skin receives less heat from their core.


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Testing the "Fat Man" bomb

In this historic photo, bomb assembly group leader Norris Bradbury stands next to the "Gadget". This nuclear bomb was detonated on 16 July 1945 at the Trinity test site in New Mexico, as a trial for the "Fat Man" bomb that would be dropped on the Japanese city of Nagasaki on 9 August 1945.

Gadget's explosion at 5.30 am was felt 160 kilometres away and sent a mushroom cloud billowing over 12 kilometres high. Because of the secrecy surrounding the US atomic bomb project a cover story was issued, telling the press that an ammunition store had exploded.





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The face of a tiny monster

This is the head of a pork  tapeworm (Taenia solium), a human parasite that can be transmitted through eating pork that hasn't been cooked properly, or by drinking contaminated water. The adult worm develops form a larva and can live in small intestine, growing up to three metres in lenght.

This image was taken with a confocal laser microscope. It shows the tapeworm,s two suckers (which look like eyes) and its hook-filled rostellum.




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Are there places in space we can leave spacecraft without them drifting off?

A Lagrangian point is essentially  a "parking space" for spacecraft, where the forces of gravity balance out to allow a probe to stay in one place with minimal fuel consumption. There are five of these points in the Earth-Sun system, but only two are currently occupied by a total of five spacecraft.


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Does a smart person have more brain ceels than a less intelligent person?

We have around 86 billion neurons (brain cells), but we don't know exactly how many each person has in order to compare. But last year researchers at the Free Amsterdam University found that people with a higher IQ had neurons that were longer, more complex and carried more information around the brain.


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Why do we rub our eyes when we are tired

After a long day at school or in the office, our eyes can begin to feel sore and dry. By rubbing our tired eyes we stimulate the lacrimal gland above the eyeball. which then producers extra fluid to re hydrate the eye. However, rubbing your eyes can actually make you feel more tired.

By putting pressure on the eye, the vagus nerve is stimulated, which can reduce your heart rate, making you feel relaxed and ready for a snooze. Be warned, too much pressure and chronic rubbing can cause a range of health issues, including causing infection of scratching your eye's cornea.


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Why don't humans grow to be ten feet tall?

Humans have evolved over millions of  years, and natural selection has determined our genetic makeup. In fact, between 60 and 80 percent of our height is down to genes, and the rest is influenced by environmental factors, such as nutrition.




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