When we sleep, a lot goes on in our
bodies. We continue to breathe and
growth hormone is released – we do not
need to be awake for these things to
happen. Similarly, we have some
awareness of our body position and
movements, and some people even
manage to sit up or walk during their
sleep! Most of us have enough
awareness to ensure that we do not fall
out of bed, but this ability develops
over time. Young children are still
growing and understanding
how their bodies fit into the
world around them, which is
why they might benefit from a
bedrail. AGr
Why does 37°C feel
so hot when our
bodies are at that
temperature already?
Why do champagne bubbles rise from the
bottom of a glass?
The bubbles are filled with carbon dioxide (CO 2 ), a gas 800 times
less dense than the surrounding liquid. Molecules of this gas
accumulating in imperfections in the glass and start to form a
bubble, whose low density supplies enough buoyancy to break off
and float towards the surface. In the process they run into more
molecules, making the bubble even bigger and more buoyant, and
accelerating its ascent. RM
If your champagne glasses are
grubby, bubbles will form on the
specks of dirt, betraying your
shoddy washing-up skills