BBC Knowledge 2017 02

(Jeff_L) #1
QUESTIONS ANSWERED |
YOUR

It’s not just because it reminds you of the comforting
smell of your granny’s house. Lavender oil is mainly
linalyl acetate and linalool, which are chemicals that
are both rapidly absorbed into the bloodstream.
Studies on mice have shown that these compounds
inhibit several neurotransmitters and have a sedative
and pain-relieving effect. In humans, lavender also
lowers the heart rate and reduces anxiety. LV

Why does the smell of


lavender help you sleep?


Lavender harvesting
in France: the world’s
most relaxing job?

There is a psychological link:
people who claim the weather
affects their joints do feel
more pain than those who
don’t make these claims.
If weather sensitivity was a
purely physical phenomenon,
then people would be affected
whether they believed that the
variability was related to the
weather or not. But a 2007
study also found that every
10°C drop in temperature
resulted in worse arthritis
pain. This may be because
cold weather causes changes
in the fluid that lubricates
each joint. LV


Why does cold weather


make joints sore?


VITAL STATS


The number of days
after conception that
a human embryo’s heart could
start beating.

16

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