Winter Wonderings – Why Does Frost Make Patterns?
The third #winterwonderings post from our Science Correspondent, Samantha, we take a look at why frost makes patterns. Many countries have a mythical figure like Jack Frost, who draws in the ice and frost in winter, but what really causes these gorgeous natural designs.
How to Stay Safe at the Beach
Although beaches are fun places they can also be dangerous, and you may have heard some stories in the news lately about people getting into difficulties when they’re in or by the sea. Our science editor Sam Gouldson, who lives on the Sussex coast, shares her tips for beach safety.
Go to a Beach with Lifeguards
Many beaches have lifeguards, who are trained to keep people safe whether they’re on the beach or in the sea. You can find out where these beaches are by searching the Good Beach Guide (for the UK), Irish Water Safety (for Ireland) or the ILSE (for Europe). Find out more about the RNLI Lifeguards in UK here.
Pay Attention to the Flags
Beaches in the UK use a flag system to inform you of possible hazards. If there are red and yellow flags this means that there are lifeguards in that area and that it’s safe to swim.
A black and white chequered flag means that the area is for people using paddleboards, surfboards and kayaks, and that you should not swim there.
A red flag means that the area is dangerous and you should not go into the water for any reason. There may also be information boards and signs at the beach, and you should read these thoroughly.
Stay With Your Group
If you stick with your family or friends you can all keep an eye on each other. Find somewhere distinctive to use as a base while you’re at the beach and agree where you’ll meet up if you get separated.
If there are younger children in your group make sure they’re with a responsible adult or older teen. Some beaches have a wristband scheme so that children can be easily identified and their group members contacted if they wander off; if the beach you’re visiting has one of these schemes, take part.
Learn About the Sea
Different beaches have different conditions. The tide can come in much faster at one beach than at another, and you should always keep an eye on the water and which direction it’s flowing in. You can look up tide tables online so that you’re aware of when the tide is likely to turn and don’t get cut off from the shore.
Some beaches have dangerous features called rip tides, which are strong currents that can quickly sweep you out to sea without warning. Always check with the beach’s lifeguards if there are any areas that you should avoid – many beaches have a noticeboard to inform visitors about the current conditions.
Waves can also be dangerous, depending on how fast the water is moving and how steeply the beach shelves. Some beaches will have sharp rocks or other hazards that may not be clearly visible from the shore. Again, check the lifeguard’s advice before you go into the water.
If the weather is cool, consider wearing a protective suit to keep you warm in the water, as cold water shock can affect your breathing, blood pressure and heart rate.
Be Careful When Using Inflatables
Inflatable toys and beds are designed to be used in swimming pools, not on open water. But if you do use them make sure there is an adult with you and that you’re in the lifeguarded area between the red and yellow flags.
You should stay near the shore and never use inflatables when there are big waves or an windsock is flying; these are signs that the wind is too strong.
Know What to Do If You Get Into Trouble
If you find yourself in difficulties, stay calm. If the water is shallow enough for you to stand, wade through the water instead of trying to swim in it. Raise at least one hand in the air and shout loudly and clearly for help, and don’t try to swim against the tide because you’ll just tire yourself out.
If you have a board or an inflatable hold onto it; not only will it help you stay afloat it will also make you easier for rescuers to spot.
If you see someone who is in trouble in the water, stay calm. Alert the lifeguards, or if you can’t see them call the emergency services on 999 (in the UK) or 112 (anywhere in Europe).
Stay Safe in the Sun
Although the sea can be dangerous, so too can the sun. Always use sunscreen with a sun protection factor (SPF) of at least 30, and re-apply frequently.
Keep your head and shoulders covered, wear sunglasses to protect your eyes and stay in the shade at the hottest part of the day (usually between 11am and 3pm).
For more information read “Why is too much sun bad for you and how does sunscreen work?”.
A Poem by Amber – Written by You
I’m Amber and I’m 14 years old. I love reading, writing, drawing and basically anything creative! When I’m older I want to be a freelance journalist – I think that would be quite fun! I like reading YA and my favourite authors are Suzanne Collins, J.K Rowling, Luisa Plaja and Cathy Cassidy.
My Teen and YA Book Review Blog The Mile Long Bookshelf The Mile Long Bookshelf Facebook page.
@MileLongBookS on Twitter.
Featured Image NASA/Goddard Space Flight Center
A Kid-Friendly Explanation of The Big Bang & An Amazing New Discovery by Scientists
Most scientists believe that the Universe began in a Big Bang around 14 billion years ago. The entire Universe was inside a bubble thousands of times smaller than a pinhead, and was hotter and denser than anything we can imagine.
When the explosion called the Big Bang happened, the Universe as we know it was born. In a fraction of a second, the Universe grew from smaller than a single atom to larger than a galaxy. It kept on growing, and is still expanding today.
Now researchers in America think they have found traces left in the sky that prove this that the Big Bang did really happen. It takes the form of a distinctive twist in the oldest light detectable with telescopes. These twists of light are called ‘gravitational waves’ – the effect is a little bit like how waves form on the surface when you drop a big stone in a pond. However, you also have to imagine that the Big Bang formed the pond itself.
The team leading the project, known as BICEP2, has been using a telescope at the South Pole to make detailed observations of a small patch of sky. The aim was to find evidence of ‘inflation’ – the idea that the cosmos grew rapidly in its first trillionth, or trillionth of a trillionth of a second – growing from something unimaginably small to something about the size of a marble.
The leader of the team, Prof John Kovac of the Harvard-Smithsonian Center for Astrophysics said:
“This is opening a window on what we believe to be a new regime of physics – the physics of what happened in the first unbelievably tiny fraction of a second in the Universe.”
Over the coming years, scientists will work hard to investigate every aspect of this discovery. Other experiments will be carried out to see if they can replicate the findings of the American team. If this research is confirmed, it will be one of the greatest scientific discoveries of our time.
EDIT
Dr Sarah Bearchell drew our attention to this video, which explains the concept of gravity and gravitational waves with the help of a towel, an apple and a ping pong ball. Check it out