I randomly stumbled on Science Update a year or so ago, and it's quickly become one of my favorite podcasts because it has a format that it follows and it doesn't feel any need to stray from it. Every weekday morning it has a one minute episode about something new in science news, or answering a listener question. You find out something interesting, and it doesn't overstay its welcome or get too technical. Sometimes they interview the scientists about the topic, so you're hearing first hand how someone is explaining their research. But again, never over a minute. It's actually a blessing to find a podcast that doesn't start thinking that it's so important it needs to get more and more expansive. A minute a day is perfect.