Can astronauts urinate while they're standing in space without getting themselves into too much trouble?

As Ernest mentions, on the ISS you pee into a hose so leakage is avoided. It is captured and filtered by the Waste Hygiene Compartment.

If you're asking what would happen if you didn't use a hose - yes, it would get messy fast. Any free liquid balls together and floats until it hits something, at which point it globs into an interesting surface which sticks due to surface tension.

Since your bladder gives some significant velocity to the liquid it would bounce all over the place unless you are careful to deposit it into some sort of contained volume. Astronauts in space suits use a form of fancy space diaper and so the liquid is immediate absorbed to avoid this issue. Honestly this is the best option if you don't have the high tech suction hose equipment.

My friend Suni giving a good tour:

What areas of the body does a rowing machine work on?

With the standard air or water type, the lower body, and the upper body pulling muscles. The main movement part are the legs, the lower back muscles and the arms. Other stabilizing muscles react accordingly.If you use a two piston hydraulic rower, by reversing the seating position, you can exercise the upper body pushing muscle groups.There is

What are some good exercises you can do while sitting at a desk?

If you are working on a computer all day, do eye exercises. Much fatigue comes in though the eyes, particularly as eyes are not made to keep a fixed focus for hours at a time. I discovered that if I would

Should you eat fat at every meal?

in the body building community it is considered somewhat taboo to eat fat and carbohydrates in the same meal because the insulin spike from the carbohydrates will cause the fat to be stored in most cases.  not consuming fat with simple sugars or carbohydrates has kept top professional bodybuilding athletes at the lowest possible fat levels for