No, it's not. Gravity is readily observable. It's a little different, although admittedly still surprising.
Evolution has also been observed in quite a few cases. Here is one example of a strain of e coli evolving a new functional trait in a lab. Also, antibiotic resistance of diseases are as a result of evolutionary pressures.
Locusts primarily walk only with the two anterior pairs of legs, and hop with the posterior pair.
Nope. Have you ever seen one walk? They step with the front four, and push with the back two. The gait is different, but they definitely use all 6 to walk.
Politics: A strife of interests masquerading as a contest of principles. The conduct of public affairs for private advantage. -- Ambrose Bierce