us, so joining us today is university of san francisco data scientist and mask for all founder, jeremy howard. good to see you jeremy. people asking what we can do to clean up the air. what's the data scientist talking about air filtration? >> i'm studying air filtration for covid-19 droplets that transmit disease and turns out the same basic science, so kind of the same thing. >> got it. robert has a question on facebook. wants to know why did it identify so late that wearing masks is an effective protection. >> i wrote about it back in march. it was identified early, and in fact, in east asia, a lot earlier than that. just took a long time for the parties to catch up with the science, very sadly. >> no, that is very true. we don't blame you. you were on with us, i think, pretty early on, if it's not march, it's april. i think it was march. in which you said everybody should wear masks all the time, so i've certainly been following your advice. are there practical, realistic and easy things we can do to improve the air around us and in our home? >> yeah, there is. so here's the basic thing t

howard looking like his old superman days. count that plus the foul over my syracuse guy jeremy grant. i had 1110 on the evening.t the end of the day was just too much lebron and ad you see the combo hook up right there one 14 one '08. they lead the series now 3 games to one. motorcycle riders love the open road. and geico loves helping riders get to where they're going, so to help even more, geico is giving new and current customers a fifteen percent credit on their motorcycle policies with the geico giveback. and because we're committed for the long haul, the credit lasts your full policy term. the geico giveback. helping riders focus on the road ahead. >>as firefighters prepare for a he wave this weekend some departments are adding new features to help keep them safe. sacramento fire is introducing new engines with a clean cab apparatus to filtered toxic chemicals, karma dickerson has details. >>tammy thatcher's believed to have died because of being a firefighter. but it wasn't running into burning buildings rescuing a trapped person are rushing to save a life that killed her. her memorial last december with