If you like star trek or similar science fiction, you have probably heard of the term, "space-time continuum". Well it is a real thing, as is time, and yes the definition of time still works for all of our day to day scheduling of events and activities.      When things start moving near the speed of light or are in a strong gravitational field, time might seem to go awry. We all have a good appreciation for length, width and height. As fundamental as these three dimensions are to our understanding of the world around us, modern science tells us that these are mixed into time itself. 

The picture of a central positively charged nucleus of an atom surrounded by negatively charged swarming electrons explains so much detail in the nature of our world.  This is known as the atomic model.  The behavior of gas, liquids and solids are almost completely explained with just that model (after including quantum effects).  Basic things like weather, water behavior, rock mechanics and fire to name but a small few. 

    Many people associate the image of an old man in glasses and crazy white hair with a scientist. This is largely due to the visage of Albert Einstein in his later years. Einstein is largely recognized today for his theories on relativity describing motion at the speed of light and that of gravity.  Einstein did not win the Nobel prize for either of these however, he won the award for a lesser known discovery called the photoelectric effect. This discovery was one of the foundational cornerstones giving rise to quantum mechanics. 

There are multiple conservation laws in nature meaning these are considered to be scientific truths which are fundamental and foundational to all modern science as we know it.

Perhaps the most familiar or common conservation law in science is that of the conservation of energy.

Here is a wordy topic which also happens to be rich with physics and foundational in almost every aspect of engineering.  The 2^nd law of thermodynamics states that, you cannot build a device capable of extracting heat from something to do work without having some residual useless heat output.  Perhaps more simply stated, you cannot convert a given amount of heat energy into exactly the same amount of work.  There will always be some frictional type losses that re