It was written by people who thought that placing sticks that had been peeled to make streaks in them in front of flocks as they mated would effect the patterns on the offspring:
"And Jacob took him rods of green poplar, and of the hazel and chesnut tree; and pilled white strakes in them, and made the white appear which was in the rods. And he set the rods which he had pilled before the flocks in the gutters in the watering troughs when the flocks came to drink, that they should conceive when they came to drink. And the flocks conceived before the rods, and brought forth cattle ringstraked, speckled, and spotted."
Genesis 30:37-39
By people who thought that bats were birds:
"And these are they which ye shall have in abomination among the fowls...And the stork, the heron after her kind, and the lapwing, and the bat."
Leviticus 11:13,19
And that insects had 4 legs:
"All winged insects that go on all fours are detestable to you. Yet among the winged insects that go on all fours you may eat those that have jointed legs above their feet, with which to hop on the ground. Of them you may eat: the locust of any kind, the bald locust of any kind, the cricket of any kind, and the grasshopper of any kind. But all other winged insects that have four feet are detestable to you."
Leviticus 11:20-23
That the earth was fixed (geocentricism):
"He has fixed the earth firm, immovable."
1 Chronicles 16:30
That the earth has 4 corners:
"And he shall set up an ensign for the nations, and shall assemble the outcasts of Israel, and gather together the dispersed of Judah from the four corners of the earth."
Isaiah 11:12
"And after these things I saw four angels standing on four corners of the earth holding the four winds of the earth, that the wind should not blow on the earth, nor on the sea, nor on any tree."
Revelation 7:1
Isaiah 40:22 describes the earth as a circle rather than a sphere. The authors of the Bible are completely ignorant of science. Now this is not unforgivable seeing as they wrote it at a time when we didn't know what we know now, however it is utterly ridiculous to claim that the Bible has any scientific worth. The creation myth in Genesis is just another example of scientific illiteracy. There is no reason whatsoever to consider it as fact.