Probably not deliberately, but something can always go wrong, which is probably why they added an additional clause that messages older than 30 days should be deleted.
More interesting is what happens if someone gets a new phone. In that case (if I understood correctly) they might ask for the sender to resend the messages with a different key. If they really are forced to add a backdoor then that's where I would fit in a MITM attack, as it is limited in scale and detectable when used excessively.
The Space Shuttle burned hydrogen and produced water, none of which are really easily visible to the human eye. If you look closely at a launch you might be a able to catch a glimpse of the heat shimmer from the main engine.
The space shuttle main engines did fire at liftoff while the SRBs were firing. They may be a bit hard to see at launch but the exhaust mach diamonds are clearly visible e.g. in [0]. They were much more clearly visible in the 7-ish seconds before liftoff, after the SSMEs had been ignited but before the SRBs go off.
Sorry, I didn't mean to imply that the SSMEs were not firing at liftoff. Since they fire for a few seconds before the SRBs get lit, I suspect most people know what's going on with them.
The article rather understates the use of glutamate in the body.
> it is an essential building block of protein found in muscle tissue, the brain, and other organs.
It's not only found in every organ, it's present in 99.6% of all human proteins, out of 20328 only 72 do not use glutamate, and of those 29 are keratin proteins.
Interestingly, though (just to digress -- your point is quite valid) it's not an essential amino acid for humans. Obviously it's required to make proteins, but if we don't get enough in our diet our bodies will synthesize it.
It's just interesting that the molecule we evolved to recognize as a "protein!" marker in our food turns out not to be one of the protein submolecules we actually need to surive.
I agree with you, but it makes sense that we may have evolved to be able to synthesize it. Since it's such a crucial amino acid, it would be an advantageous adaptation to do so.
I suppose that makes sense if it's one of the easier ones to produce, so many animals can produce it. So it would be a better indicator of general protein than any of the rarer ones would be.
Supposedly, the glutamate you absorb in your intestine from food is an important precursor for glutathione, which protects your mucosa from dietary toxins. It's possible that you need to consume some level of it for healthy digestion.
