It means that the message is encrypted on your phone and decrypted only at the receiver’s phone. Crucially, only the two ends have the decryption key, so it CANNOT be decrypted by the server.

This is in opposition to something like e-mail where your email is encrypted on your phone but decrypted at the email server (Gmail, etc).

>But they're probably not pinging and talking to the front desk every minute of the day

They actually are. Kinda.

There is a central server. Every time a card is swiped the lock asks the central server if the card is allowed to open that lock. The front desk can revoke (and provide) access from each card to each lock individually.

That problem is not specific to computers. 123 456 can be either one single number or 123 & 456 taken separately. Heck, negro can be dark if you read in Portuguese or black if you read in Spanish. You will know which one is the right one by using context.

In the digital world it’s up to the software to decide what 1001 means, based on context. That’s why if you open a png file with mspaint you see a picture but if you open it with notepad you see gibberish

That’s exactly the difference between a colon and a semicolon.

A colon explicitly relates the two statements. In your example, a colon would indicate that he spent three hours in the library because he couldn’t find the book. A semicolon would leave it open to interpretation: he couldn’t find the book, but that’s not necessarily why he spent three hours in the library.

So yes you can use them in the same sentence but not interchangeably. They have different meanings

We don’t. We need to take vitamins when we have a poor diet, not when we are sick… Unless that sickness is the lack of a specific vitamin itself, which was itself caused by a bad diet, so it’s not really an exception

Tectonic plates are HUGE and move slowly, which would be akin to very slowly bending a plastic ruler. You can keep bending it for a long time and nothing will happen until it reaches the breaking point and shrapnel flies everywhere

If you mean handegg the fields MAY be roughly the same since they’re synthetic but in real football the fields are not even the same size, let alone the ground itself. The grass is cut to different length, the substrate may be softer or harder, there may be large patches of grass missing… the list goes on and on.

Others have mentioned a long list of other factors that apply to any sport, but there’s also different lighting, and reference points that you acquired after playing in the same arena many times.

if you make 1000$ a month and a bottle of water costs 20 cents and I make 10$ a month and a bottle of water costs 2 cents, who is paying more?

So Alice and Bob are discussing what is the color of the sky.

Alice says it’s blue, Bob asks why Alice hates red. Bob used a strawman argument because instead of debating Alice’s argument (the sky is blue) he is debating a made up premise (Alice hates red)