The only way to truly test if a variable is undefined is to do the following. Remember, undefined is an object in Javascript. To determine if a variable or object property exists, It is good to compare to keyword undefined or you can also check the type of the object to string âundefinedâ. In the following JavaScript code we compare the num to the undefined in both way.
Nuclear waste -- The waste from nuclear power plants will be toxic for humans for more than 100,000 years. Itâs untenable now to secure and store all of the waste from the plants that exist. To scale up to 2,500 or 3,000, let alone 17,000 plants is unthinkable.
Look at the past: Humans made nuclear weapons, Humans cause wars, etc. my point is humans are the most dangerous things in the universe.eport Abuse. i agree with the other answers that man is the most dangerous. but i figure your not talking about biological creatures. in that case it would be water. water brings tidal waves, floods, mud slides and when frozen you get blizzards and ice storms. Tom R Â· 7 years ago. Thumbs up.