To tackle the problem of space debris above earth, does it look practical to use ion gun satellites to shoot ions into orbits so as to electrify small sized space debris, so that they would be slowed down by the earth's magnetic field and eventually burn up above earth?
covid-19 usually infect the lining of the throat first, so testing a proper throat swap would detect the virus pending on the sensitivity of the test. What if a whiff of viruses went straight into the lungs through deep breathing? Then the virus is difficult to detect early on, and these are usually diagnosed through a CT scan (3D sectional photos of the lungs). The precence of the virus in blood is a clear indicator of infection, but the blood does not get infected early on. The virus may also be present in the faeces. Even asymtomatic patients can transmit the virus. So basically, no single simple test can reliably detect an infection early on to ascertain who is not infected.
Therefore, social distancing needs to be maintained to avoid infection.
I am sure that lots of entities, be they individuals, small groups, mega cults, . . . have been inspired by the devastation of covid-19 that biological methods of attack can be very cheap, easy to make, devastating, and difficult to trace who did it. To keep the viruses, wouldn't refrigerated test tubes be sufficient? If not, they just need a constant supply of hosts.
After the warnings of the best minds, delivered prominently through Bill Gates since 2015, I think defence ought to take a completely new look, whether this massive wasted race of technical fire arms can ever make the world safer.