hi, i'm mikael. here's kelly and laurie. i'm kelly, nice to meet you. hi - mikael - hi.w are you? good, thanks. okay, so we're going to make bruschetta. it's very simple. everything we're using today is from our garden, and it is nice that everyone is willing to try the food, even if they're maybe hesitant, because it looks green, but we're changing people's mind about vegetables. we'll show them that ty can be turned into soups, they can be turned into appetizers. we're always having different workshops on what's growing. if we can teach people what to do with the whole foods that we're growing, and let them discover ways to enjoy it, then it's sort of a win-win for the neighbourhood. in the summer, there's also an urban farming camp for kids, and a weekly "weed & feed" program, where people can help out with tasks, and simply stick around for a collective dinner. mcquesten farm is so much more than an urban farm and market; it truly is a community hub. bruschetta for the people! we're going back out. everyone's ready to eat. and is it free? yes. i mean, really, to feed

[mikael colville-andersen] at the heart of a challenged but fiercely proud nation lies its capital. this is mexico city. this is a megacity. the fifth largest in the world: 21 million inhabitants. it's also the eighth richest city in the world, and yet 30% of the population live in poverty. what a vast spectrum in which i get to work in my search for the life-sized city. but i know that there are people here, like in cities everywhere around the world, who are working positively to force urban change. i want to hear, see and experience what they're doing to improve urban life in this vast arena of contradictions. - this is a city that is flood-prone. it's polluted. it's a hotbed for earthquakes, and it struggles with its fair share of inequality. but man! mexico city's got that thing you just can't explain. a thing that sets it apart, that makes you want to keep on coming back. because although this city fights every day with the elements, so many elements, it's also a place that is rooted in ingenuity and creativity. you certainly can't tell it now, but this was once an island city

. >> reporter: mikael dolsten is pfizer's chief scientific officer. do you think there's any chance we might need a fourth shot at some point because of omicron? >> i think it is very likely that we will need a fourth boost, possibly already this spring, particularly if omicron continues to dominate. >> reporter: the head of the c.d.c. said tonight most u.s. omicron cases are in vaccinated people. nearly all have mild symptoms with cough, congestion, and fatigue. meanwhile, the chief scientific officer of pfizer told me they expect to have a vaccine for children as young as six months by the summer. norah. >> o'donnell: that is some news. nikki battiste, thank you. in south africa, where omicron was first discovered last month, cases have jumped from about 200 per day to about 20,000. cbs' debora patta reports >> reporr: firmly he grf a covid storm driven by omicron, south africa's fourth wave looks nothing like previous ones. six months ago, ward was overflowing with patients. now it's completely different. it's half empty, despite soaring infections

hi mikael. how are you doing? - how are you? good. - good to see you. you too. welcome to jeanne d'arc street. - thank you. it's a street that we chose, at the american university, to provide a modern, pedestrian-friendly street in the city. - as a way to give back to the community, mona el hallak and her team at the american university of beirut developed a project called neighborhood initiative. together, they transformed the street just outside the campus walls by creating wider sidewalks, adding benches and improving green spaces for public enjoyment. but that's not all mona does, not even close. born and raised in beirut, mona was only seven when the civil war broke out. through education, activism and design, she now works relentlessly to improve her beloved city. o.k. so architect, urban activist, urban design initiator, and now you're sort of muscling your way into politics. what's up with that? i mean, i've been, all my life, trying to preserve heritage buildings, to preserve our natural coast, to look into housing alternatives for affordable housing, w