Conservation law, also called law of conservation, in physics, several principles that state that certain physical properties (i.e., measurable quantities) do not change in the course of time within an isolated physical system. In classical physics, laws of this type govern energy, momentum, angular momentum, mass, and electric charge.
On New Yearâs Eve, the Metrorail system will open at 7 a.m. with special extended service on all lines until 3 a.m. The additional three hours of service â consistent with past years â is a special exception to a moratorium on extended hours during the year-long SafeTrack maintenance program.
Don't worry, we have you covered. We found a number of stores that will help out all those procrastinators. Macy's, Kohl's and JCPenney are all open tonight night until 6pm. If you want to get your family a new TV or an iPad, Best Buy is open until 6pm tonight as well. Now, for those of you who are really pushing that CHRISTMAS deadline. Here are some of your options: Walmart is open until 8pm.