Valentine's Day is all about the hearts: heart-shaped chocolates, cards, balloons and even pizza. But the heart hasn't always ...

What does touching your neck mean? Created with Sketch. When you’re stressed out, touching or stroking the neck signals a pacifying behavior. We all rub our necks at the back, the sides ...

Free body diagrams do not need to be drawn to scale but it can sometimes be useful if they are. It is important to label each arrow to show the magnitude of the force it represents. The type of ...