Because they do not possess the same vocal cords arrangement as Humans.
<span>Barking cause lower amount of muscle strain in Vocal cords compared to when humans are yelling.
</span>This make dogs able to barks endlessly without having to create any damage on their vocal cords.
<span>A sudden realization of the solution to a problem is called insight.
The term insight stands for problem solving. If </span><span>the solution to the problem occurs suddenly in conscious then that is a insight in problem solving.
</span>The first stage of the insight is working on the problem without solving it.The second stage of insight problem solving is incubation, the third stage is finally producing the insight and the last one, the fourth <span>is verifying that the insight is correct. </span>
<span>Copernicus placed the sun at the center of the universe. Ptolemy place the earth at the center.
Both of these view couldn't be proven at that time, but only Copernicus experienced negative backlash by the church because it's deviate from the biblical teaching. Not until year of 1600s before another intellects name Galileo created the invetions that might prove Copernicus' theory (which also being torn apart by Religious groups)</span>
