Mars has the problem of so little atmosphere that aero braking barely slows you down to a speed where you can open a parachute and not have it ripped apart as you are still travelling at supersonic speeds. And the atmosphere is just thick enough to upset rocket engines firing into the oncoming stream/airflow so you can't do a powered descent.
Link to Original Source
I tend to agree. Trying to weld a hot thing to a cold thing never works well. The process is touchy and unreliable.
I think I may of replied to you before, but parts from my Solidoodle are very strong. The heat transfer from the extruder when printing at 0.3mm is more than enough to slightly melt the previous layer and fuse them. Printing at 0.1mm makes an almost seamless print. When printing with a heated bed, in an enclosed space the whole print is slightly tacky and soft. The prints do have a grain, and that is the weakest part, but you can design items with that in mind. If you are worried about printing something out of ABS/PLA that is going to fail due to stress, having it injection molded isn't going to increase the strength factor by enough margin to stop it breaking.
Unions done wrong fuck the system up. Builds adversarial us (the workers) vs them (the management) mentalities. Unions done right, can and does work very well. It is collaborative, where everyone works together to make the company better, struggle through the bad times etc. This collaboration works both ways, if the company is hitting hard times, the board, management should be taking paycuts themselves, stopping bonuses. They have failed to lead the company into a properous position. Before they have the cheek to ask the workers to cut their salaries, they should be severely cutting their own pay first. Put their hands up in the air, and claim "Yes, we fucked up", so how can we get through this? The CEO has taken a paycut of 80% sacrificing $25 million saving about 300 jobs, can you guys cut 15% until we get through this?
Both Germany and Japan after the second world war had written into their constitutions by Eisenhower, MacArthur and their aides various protections and rights for workers to bargain and act collectively. They both have become some of the biggest players in the automotive industry, and this is not by coinicendence, it is by design.