Children ‘s science questions Why are the kitchen top cabinets so high that Mom and I need a stool?

Children’s science questions also consider driving in a roundabout, a school trip with a jet fighter, and the trolls ending up in the stomach. And what is the size of an elephant’s egg?

Frida Berghem, 10

Everyone the starting point for the design of spaces and furniture is human dimensions, but the dimension is most often thought of as an adult male. Probably the reason for this is that men have had the most power in societies.

The predecessor of the current kitchen cabinets was invented in Frankfurt, Germany in the 1920s. The tubular small kitchen formed by the lower and upper cabinets was said to be a laboratory kitchen. This stabilized the dimensions of the furniture.

The cabinets have since become a little higher. At the same time, the average length of people has increased. There is also a desire to make use of the room space above the kitchen furniture, so the upper cabinets are often extended to the ceiling. Therefore, you should only place items that you do not need on a daily basis in the top cabinets.

Recently, a lot of attention has been paid to so-called inclusive design, i.e. taking all kinds of people into account in architecture. Thus, kitchen furniture is also designed to be adjustable so that it is suitable for a person in a wheelchair, for example. In this case, even the upper cabinets can be reached without a stool. It is also fashionable to design kitchens completely without top cabinets, so that even tables or lamps can be hung on the table top.

Pirjo Sanaksenaho

architect, professor of building design

In some countries, the right way to drive is in the left lane and not the right, as we have.

In some countries, is the roundabout driven clockwise?

Stella Lehtovuori, 10

Yes run. It is usually the case that a roundabout, ie a roundabout, is driven clockwise if left-hand traffic is in use in the state.

Such countries include, for example, Britain and some of its former colonies, such as Malta, Ireland, Cyprus, India, Australia, New Zealand and some East African countries.

There are also Magic Circles named after a popular children’s cartoon series in use in Britain.

They have a two-lane large roundabout with a clockwise outer circumference and a counterclockwise inner circumference. They also include smaller roundabouts connecting access roads and a large circle.

In 1972, the first such roundabout was built in the city of Swindon. It has been voted Britain’s fourth scariest intersection and the country’s worst roundabout.

It was made to connect five roads leading to the same intersection. However, the roundabout is very safe. It is based on a slow driving speed.

Mikko Pentti

assistant

Mobilia Museum

Horner could get to school, but flying it would be awkward and dangerous.

My school trip is 700 meters. How fast would I get to school if I flew on the Hornet?

Magnus Pansegrau, 7

Hornetilla firstly, a much slower pace is reached near sea level than in the high sky because of low air resistance at low altitudes.

If the Hornet were to fly touching the roof of the school, the 700-meter journey would take a little less than two seconds at best. The peak speed of the Hornet in low-flying is about 1,300 kilometers per hour.

It is virtually impossible to get on and off a plane advancing at such a speed. Leaving would be successful in the throwing seat, but it would be life-threatening and hitting the school would hardly succeed.

For take-off and landing, the Hornet needs a one and a half mile runway. The pavement must be concrete, asphalt or steel.

There should be no more altitude variations on the runway than at a civil airport. The width must also be about 12 meters and the height at least 6 meters.

If there was a suitable runway in front of the school, the fastest option would be to climb the stationary Hornet, which would roll across the ground to the school.

Even if the trip was more or less straightforward, it would take at least 34 seconds. The time it takes to get to and from the stopped Hornet is not included. With a regular car, the same trip would be completed in less than half a minute.

Juha Honkonen

specialist researcher

National Defense College

Troll bacteria should be brushed away from teasing your teeth.

Can toothpicks in the mouth travel to the stomach? What happens to them in the stomach?

Ida Lehtonen, 3

For tooth trolls say bacteria in the mouth that are capable of causing tooth decay. Their king is Streptococcus mutans a bacterium called.

The number of trolls can be reduced by brushing your teeth regularly.

Trapezoid bacteria and other oral bacteria are transported daily to the stomach and from there on to the intestine. It is very common because each of us unnoticed swallows them with saliva, drinks and food.

In the stomach, some of those bacteria are destroyed because they cannot withstand its acidic conditions. Bacteria that have survived to the gut face many other bacteria. They are excreted from the intestine with the poop.

However, some of the bacteria in the mouth also remain in the gut for a long time. Usually there is no harm in them. Especially there are no toothpick bacteria.

Hannamari Välimaa

oral microbiology specialist dentist

University of Helsinki and HUS

The elephant and human egg are perhaps surprisingly quite the same size.

What size is an elephant’s egg?

Samuli Valli, 4 and Tristan Myllyviita, 4

In Africa the diameter, i.e. the diameter, of the ovum of a live savannah elephant is about 0.1 millimeters. One millimeter would therefore fit about a dozen of them.

The eggs of other elephants are most obviously of the same size. So they are quite small.

By way of comparison, a human ovum is approximately the same size. Mouse eggs, on the other hand, are only slightly smaller. They are about 0.07 millimeters in diameter.

The largest eggs of living animals today are ostriches. They are about 13 to 17 centimeters in diameter and weigh more than a kilogram.

The eggs of many other birds and also fish are much larger than those of elephants. The size of the eggs of large animals is not necessarily larger than that of small ones, but often the opposite is true.

Elephants and many other large animals have ultimately not needed huge eggs for millennia of species development. The materials needed for their individual development fit in a small space.

Jukka Kekäläinen

Assistant Professor of Animal Physiology

University of Eastern Finland

Send the question, the full name and age of the questioner to hs.tiede@hs.fi. The column will be edited by Touko Kauppinen and Juha Merimaa.

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