A proof of 3 dimensional stresses for the mohr circle
Yes
yes
The mysteries and questions of Quantum Mechanics are largely unsolved.
The hardest problem unsolved is debatable. One of the hardest problems socially unsolved is racism. People of different races and from different cultures struggle to find a solution for accepting each other as equal. One of the hardest problems unsolved in medicine is curing illnesses such as cancer. The world can be complex giving humanity a lot of hard problems to solve but by working together solutions can be found.
The hardest problem unsolved is debatable. One of the hardest problems socially unsolved is racism. People of different races and from different cultures struggle to find a solution for accepting each other as equal. One of the hardest problems unsolved in medicine is curing illnesses such as cancer. The world can be complex giving humanity a lot of hard problems to solve but by working together solutions can be found.
As of now, the Yang-Mills existence and mass gap problem remains unsolved in theoretical physics.
The Unsolved happened in 1997.
The Riemann Zeta Function: http://mathworld.wolfram.com/RiemannHypothesis.html Because its mathmatics greatest unsolved problem.
What to do with the slaves (now that they are homeless and jobless) and how to punish the South (radical view) or readmit them into the Union with consequences.
that is the greatest unsolved mystery of them all.
The case remained unsolved.
Unsolved History was created in 2002.