File:NLC416-08jh014136-39084 科學知識.pdf

目錄
part ⅰ
why can cats see in the dark?
why does a glowworm glow?
how does a peacock know when it is going to rain?
why ars some people dark and some fair?
people who are color-blind
dewdrops
nature's winged huntsmen
why animals in snowy countries wear white coats?
fish's organ of hearing
industries that depend upon cold storage
what changes the way of the wind?
why are some plants always green?
banana fiber cuts cost of pencils as substitute for graphite
why does a bad egg float while a good one sinks?
why is the center of a gas flame blue and the outside yellow?
why some animals can do without food for a very long time?
why are thers some illnesses that we cannot get twice?
can insects communicate with each other?
why do we forget some things and remember others?
why can a worm still live when it is cut in two?
what makes the halo round the moon?
why do some things bend and others break?
is the blood alive?
why can we hear so much better over water than over land?
what makes hair turn gray?
whers does our warmth come from?
why does the color rush from the face when we are frightened?
does whisky make people marmer?
why did baby's eyes change color?
is night air dangerous?
if trees grow from seeds,how did the first seeds grow?
why does a bird forsake its nest if its eggs are touched?
what is the shortest life in the world?
what makes a headache?
what makes the new electric lamps so bright?
how do we know we have dreamed when we are awake?
does sympathy help us?
why does the sea not freeze?
the great value of eggs as a food for man
what makes the sea roar?
why does the light give light?
what is a sponge?
the things that we must know and the things that we should know
where are the clouds when the sky is quits clear?
ouget we to be afraid to die?
why do we laugh?
how many miles is the sky from us ?
men of muscle and men of mind who eat no meat
difference between instinct and intelligence
why does furniture crack or make noises at night?
why are some plants poisonous?
is there any water in the sun?
where doms all the bad air go?
why does the wind blow more on the top of a hill than below?
do we change our bodies every seven years?
the wonderful shells of which rocks are made
does change go on in other worlds?
why does yeast make bread rise and biscuits bubble?
why are roses red?
how long has life existed on the earth?
does a fish drink?
on what do fishes feed?
the power of memory
why does a dog go round and round before it lies down?
what is the most valuable thing in the world?
is a clever man's brain larger than a stupid man's?
what do we mean when we speak of a calorie?
why have leaves different shapes?
can flies hear?
does reading help us to remember better than writing?
is it true that oil still exists arter it has been burned?
do birds always sing the same song?
why does damp air ofien make us ill?
is it good for us to laugh?
why does the poison inside the wasp's body not hurt it?
the marvel of the glowworm and its wonderful lamp
what is the blue light that we often see on the sea at night?
do the stars fall down?
what makes people faint?
when a donkey eats a thistle,why do not the thorns hurt him?
why do we ever stop growing?
different ways in which a thing may give out heat and light
have fishes any feeling?
what makes tree turn into coal when they sink into the ground?
can we store sunlight?
the wonderful little cell that does all the work of life
do flowers sleep at night?
what is the will-o'-the-wisp?
why do we cook our food?
how does a dog know a stranger?
why has the earth no light of its own like the sun?
what is it inside a cat that makes it purr?
when bees take honey from flowers,do ine flowers get another supply?
is the earth growing smaller?
how can plants grow on a bare wall?
why are boys stronger than girls?
part ⅱ
what makes a volcano?
of what does the hen make her eggs?
why do lossters turn red in boiling?
could the sky fail down?
how do the birds find their way?
why can't a baby tale when it is born?
are we taller in the morning than at night?
why can parrots talk,and not other birds
why does an owl come out only at night?
what makes people walk in their sleep?
what use are the different colors of birds'eggs?
why have we finger nails?
why does the sun make our hands and faces brown?
why do empty vessels make more sound than full ones?
why is the sky in italy so blue?
how does a sponge hold water?
why does liquid run up a ture when we suck it?
what causes chilblains?
what does a house become very dusty it we lock it up for a year?
what is the one and only thing that human beings can ever do?
why is a spark made when steel is knocked by a hard stone?
why do loud noises make us deaf for a while?
do ants catch slaves as men used to do?
which is more intelligent,the animal that eats flesn,and that which eats grass?
why are some things poisonous?
how does seaweed tell us what the weather is going to be?
do seeds breathe?
how did men lrarn to talk?
why do we dream?
do fishes shut their eyes?
what help do the tiny creatures render to mankind?
what is light made of?
do we see ourselves in dreams?
how is it that fishes do not drown?
what is it like at the bottom of the sea?
why is the air fresher afier it has been raining?
how do fish live in a frozen pond?
why is fire hot?
the outer skin that is not alive,and the inner skin that is alive
why do cherries and plums have stones?
why animals prick up their ears at any sound?
why has every cloud a silver lining?
why does it not hurt when we cut our hair?
why does oil float on the surface of water?
why does salt melt snow?
how is it that a bird can fly when it is heavier than air?
what work does foliage do for us?
why cannot we fly in the air as we swim in the water?
how does the deer lose its horns in the spring?
does rain melt the rocks?
why can baby animals waie so much soones than human babiks?
why does the same flower have many different colors?
why are we afraid in the dark?
why does red irritate a bull?
are the best speakers the best thinkers?
how the water vapor in the air protects us from the sun's rays?
how was it discovered that the sun is larger than the earth?
where do shells come from?
where are the fishes that lived in the shells we find by the sea?
why does shallow water frkazh first?
how high can man fly?
where does the oxygen in the sun come from if there are no plants?
do birds talk to one another?
why should lightning strike certain things and not others?
why cannot we sleep with our eyes open?
are all animals born blind?
why is the fire hot?
what makes colors in the fire?
why is it that trers grow straight?
is a lighted candle in front of a mirror equal to two candles?
what makes the knots in the wood?
wht do flowers droop in a heated room?
what made the mountains?
why does manure make plants grow faster?
why is running water purer than stagnant water?
what is a thermos flask?
what causes ceamp?
what are freckles?
why is it that purn oxygnn will kill us?
how does camphor keep moths a way?
can anything travel faster than thought?
how is it that the fog deadens sound?
why are some diseases infectious and not others?
why does a hen not crow?
why does it thunder,and on which side of the clouds is the thunder?
why does sailing make some people ill?
where does the rainbow end?
would the end of the earth be like the going out of a star?
how did all the metals get into the earth?
how is the area of a country measured?
why is the sea never still?
where does the wind go to when it does not blow?
what makes the echo when we shout out of doors?
what are the streaks of light that sometimes shoot across the sky?
why is the sky blue?
why does the sea look sometimes blue and sometimes green?
why the sea is hottest when the sun has lost its greatest power?
why are smadows longer at the end of the day than at the beginning?
why does iron feel colder than wood?
why is it that iron does not burn away in the fire?