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Martin, look at your fingertips after that swim.
They look like tiny roadmaps.
Why do our fingers wrinkle in water?
Welcome to Curious English from your EnglishToolbox.
Make a guess before we explore the evidence.
Do fingertips simply soak up water like a sponge?
That is the familiar explanation,
but it is not the whole story.
The wrinkling is linked to changes controlled bythe nervous system.
Researchers can observe wrinkling after a person'sfingers stay in water for a while.
It is not exactly the same as skin swellingeverywhere.
One question is whether the wrinkles help us gripwet objects.
Grip means hold something firmly.
A study found that people handled submergedobjects more quickly with wrinkled fingers.
The researchers suggested the grooves might helpmove water away from the skin.
A later study looked at the force needed to holdwet objects.
It found that wrinkling may make grip moreefficient in watery conditions.
That sounds like evidence for a useful effect.
But does it prove that fingers evolved for thisexact reason?
No, that explanation is still a hypothesis.
A hypothesis is an idea that can be tested, not asettled fact.
We should separate what a study observed from whatscientists think it might mean.
This pattern may help us handle wet things.
May help is careful language.
It shows possibility, not certainty.
Another useful phrase is the evidence suggests.
The evidence suggests that wrinkles can improvehandling in some tasks.
And researchers have not proved the evolutionaryexplanation.
We should be careful about how strongly wedescribe the research.
One study observed that people moved submergedobjects faster with wrinkled fingers.
A later study tested how efficiently peoplegripped wet objects.
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These results point in a similar direction, butthey do not answer every question.
For example, they do not prove that the wrinklesevolved for this purpose.
This is a useful way to talk about science.
Researchers observed an effect.
They suggested one possible explanation.
More evidence is needed before we treat thatexplanation as certain.
Let us review.
Grip means hold firmly.
A hypothesis is an idea to test.
The evidence suggests something, but does notalways prove it.
Your turn.
If research supports a possibility but does notprove it, what careful phrase can you use?
In science separate what researchers observe fromwhat they think may explain it.
The evidence suggests is careful language when aresult supports an idea but does not prove it.
Choose the speed that helps you follow each stepof the explanation.
The link is in the description.
Stay curious and keep asking good questions!
![Calm English [STILL] - Where Are You Right Now?](https://image.listen.style/img/mXRvkoujf8urIImsg7t82OwfehP9B5EloY9tApA8McU/resize:fill:80:80/aHR0cHM6Ly9hc3NldHMucGlwcGEuaW8vc2hvd3MvNjhiZmZjNGNmNWM1YWZlNWMyNTdiZDIyLzE3ODQwMTY4NzYyNjYtZGQ1MGQ4NjMtYzNjZC00MTUyLTg5MGMtZTljYzY3NGRjZGI1LmpwZWc.avif)
