科学知识.pdf电子版

目录简介

目录

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 tree......