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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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Does China really have 5000 years of history?

This claim is based on the supposes existence of the Yellow Emperor, said to be the common ancestor for all Chinese people and the founder of Chinese society, ruling from 2697 BCE.

However, there is no evidence only stretches back to the Shang dynasty, founded around 1600 BCE. Other civilizations predate China-the world's first city dates back 7000 years, and writing systems in Egypt and Mesopotamia existed 1000 years before Chinese writing.

Archaeological evidence dates back to the Shang dynasty, founded c.1600 BCE

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Reasons why are the Mars Rovers so slow

There are several reasons for this. Firstly, using solar power limits the energy available. Rovers are also reliant on controllers on Earth, who need time to issue commands.

And there's the suspension.The rovers, with their rocker-bogie suspension, can climb over rocks larger than their wheels. But this can generate a lot of stress, which is amplified by speed, so going slowly avoids damage.




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Can microwaves make food cold?

Microwaves heat food by creating high-frequency electromagnetic waves. The energy from these waves is absorbed by the food inside, causing its molecules to move around and generate heat. This process can't be easily reversed-to slow down the movement of molecules quickly you need specialist equipment such as liquid nitrogen or lasers.


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Follow these steps if your laptop battery is dying

The biggest drain on your laptop's battery is the display, so if you need to squeeze some extra power out of your device then the first step is to turn down the screen brightness. Next you should turn off any unnecessary applications running in the background, and if you're not using them, switch off Wi-Fi and Bluetooth too.

Some laptops will even have a power-saving mode to do all of this for you to make is easier.


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Is there any life high up in earth's atmosphere



The atmosphere is a mixture of gases that protects our planet and makes life possible, but whether life can exist high above the Earth's surface is up for debate. While microscopic organisms have been reported as high up as 77 kilometres, there is doubt over how they got there and whether they can grow or divide in such dry and cold conditions.

These microorganisms could have been carried into the atmosphere by storms and hurricanes, for instance. As many experiments date back to the 1930s, the results need verifying.

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highest in sugar could be deadly for dogs



You should always be careful about what you let your dog eat. A common sugar substitute found in everything from chewing gum to peanut butter can be deadly for man's best friend, according to the US Food and Drug Administration (FDA). Xylitol, a type of sugar alcohol that is sometimes found in sugar-free foods, is safe for humans, but it can be poisonous to to dogs. It can be found in many foods and consumer products, including gum, sugar-free chocolate, breath mints, baked goods, sugar-free (or "skinny") ice cream, toothpaste, cough syrup and some peanut and nut butters.

When dog eat xylitol, it is quickly absorbed into the bloodstream and causes a rapid release of insulin, the hormone that helps sugar enter cells. This insulin spike may cause dogs' blood sugar levels to plummet to life-threatening levels, a condition known as hypoglycemia, the FDA said. In humans xylitol isn't dangerous because it doesn't stimulate the release of insulin. Signs of xylitol poisoning in dogs including vomiting, weakness, difficulty walking or standing, seizures and comas-typically occur within 15 to 30 minutes, and deaths have occurred in as little as one hour, the FDA reported.

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How the brain coordinates eating

The act of swallowing is one of the most delicate and complex processes performed by the human body, even though we rarely offer it a second thought. Like many crucial processes, much of swallowing is an involuntary action.



This ensures that lubricated food is moved from our mouth to our stomach without getting stuck, coming out of our nose or blocking our windpipe.

The key control centre of swallowing is the brain stem, home of the medulla oblongata. This network is connected to a collection of cranial nerves that perform important functions, including sensing and controlling chewing, tasting, salivation and swallowing.

The cranial nerves report the location and texture of the food bolus to the brain stem as it moves from the mouth to the pharynx to oesophagus, triggering muscle contractions along the way.

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Watching wildfires from space

At a safe distance from the surface, beyond the 100-kilometre-high karman line that marks the border between Earth's atmosphere and space, a NASA satellite snaps this photo of a wildfire blazing over California. These satellites effectively act as extremely tall fire towers that are able to tell firefighters on the ground where new blazes are springing up, and give a broad overview of the extent of the wildfire.

The data provided by fire-watching satellites can also help with wildfire forecasting by showing where the driest patches of unburned ground are, and where tall grasses and scrubland could spread fires to forests.



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