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investigation. they're a series of witness testimonies and visuals, the committee presents evidence that donald trump is not only aware of the violence taking place inside the capitol, but he was counting on it. he was encouraging it through social media posts, and refusing assistance from aids and family members to stop it because he was waiting to see if it would be successful in blocking the proper counting of electoral votes that would cement his loss. according to the testimony provided by the committee for multiple instances, after his incendiary speech at the so-called stop th...

That messaging, as you pointed, out it's incredibly important and could save lives. >> do surgical masks, i mean, your assessment of them is that they're effective? just a plain surgical mask? >> no, so, right now this more contagious variant, people should have and 95, -- or kf94 mask's, those are the most protective. those are great masks at this time. surgical mask or cloth mask at this time is an adequate. >> all right, -- doctor, thank you so much. really appreciate it. on a quick programming note, make sure to stick around after velshi. doctor anthony fauci will be joining my good friend...

So does the kf94 mask, which is made in korea. the difference -- >> n95s have two straps that go around the head as opposed to a kn95 usually will have ear loops >> reporter: the typical medical procedure mask provides decent protection but doesn't seal tightly around the nose and mouth so you're concerned about this gap here, right? you want it completely tightly sealed >> that's correct. and you will know if it's not sealed if your glasses fog up. >> reporter: in short supply two years ago, the cdc recommended against using n95s for the general public now with plenty available, they're the b...

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