Why Does It Happen?

During the spring break, I went on a trip to Seattle. I saw many interesting points of interest, like the original Starbucks coffee parlour, the University of Washington and the. But a recurring detail caught my attention: Green Exit signs. In restaurants, malls, hotels and pretty much every building. I wondered why exit signs in Vancouver (and maybe the entirety Canada) are red and why exit signs in Washington State are green. What's the difference? Is there an upside to green signs over red? First of all, why do we have exit signs? Exit signs are back-lit signs that show the direction exit in public areas. They are designed so that they are easy to spot and understandable. They are not connected to the main power supply so that when the power goes out, the signs can stay on. They can be connected to a battery or an external generator, or are photoluminescence, meaning that they absorb light around and allow it to glow dimly. Common in US and Canada Pictograph Exit si...

The handshake is one of the most common ways to greet people. The handshake is a symbol for trust and agreement. There are many different variations of the handshake (one strong shake, multiple shakes, grasping the other person's left right hand with your left.) but they all have the same meaning. The handshake's rival, the hi-five and the fist bump is used to express excitement or accomplishment, it is used in a more casual situation, whereas the handshake is used in a formal situation. Origins The handshake was used all the way back to 5th century B.C. Greece. When two people shook, it made sure they were not carrying weapons. An identical use came when the Romans came in, copying the Greeks, the handshake was like an arm grab, checking each others sleeves for knives. As time progressed, and the Roman Empire collapsed, the ritual was retained in Medieval Europe. Knights shook hands to shake loose any concealed weaponry. Even though people today usually don't carry weap...