Yes, if your work involves life and death or the safety of others. Uless you are under a contract that says otherwise.
An employer should always be alert to anything that might harm the employees, so that they will remain safe and healthy.
They cannot compel you to remain silent unless this was a condition of your hiring. If this were the case, then you would have signed an agreement at that time. However, it is common for employers to negotiate such an agreement, usually requiring compensation (they buy your silence) or a reciprocal agreement (they let you "resign" in good standing and swear never to say anything bad about you).
No. You have no expectation that your birthdate remain private.
keep good friendship
Paid tax liens normally remain for 7 years beyond the date of last activity. Unpaid tax liens can remain for 15 years.
If a union goes on strike, the workers will remain out of work until the employer and union work things out. This is the union's way of having leverage over the employer.
In a closed shop, union membership is required. The employer agrees to hire union members only. The employees must remain members of the union in order to remain employed.
It depends how long you sign up for.In cases of national emergency such as war being declared then the government can, but does not always, compel you to remain until the emergency is over.
In an at will employment state the employer has the right to fill an open job, especially if it is affecting their business. However, if the disability is work related - Get a lawyer.
The International Space Station (ISS) is currently operational and being used for scientific research and international collaborations. It is expected to remain in operation until at least 2024, with discussions ongoing about extending its lifespan beyond that.
Unless a specail election is called by the Governor of the state - until the next scheduled regular election.
You will have a choice between your employer's plan and your spouse's plan. Your employer may ask you for proof that you are covered by your spouse's plan. Your employer's plan will want this, in order to ensure that people are not dropping out for other reasons (such as they can't afford to join).