There has recently been some promising COVID-19 vaccine news: a couple of candidates could become available by the end of this year. But there's a catch. The vaccines require extremely cold temperatures during transport and storage to remain viable. So dealing with them will involve what is known as "cold-chain logistics" — the movement and warehousing of goods that must be kept at low, sometimes ultra-low, temperatures. TVO.org spoke with Paul Greco, president of 360 Medical, a cold-chain-logistics manufacturer, distributor, and retailer based in Schomberg, about freezers, organizational challenges, and why he thinks the military should lend a hand.