On today’s episode of The Confluence: WESA development and transportation reporter Margaret J. Krauss explains how the Fern Hollow Bridge that collapsed was a “K-frame” bridge, 1 of only 6 such bridges in the state, and other contextual details about this structure; a Carnegie Mellon University professor will use the James Webb Space Telescope to investigate dark matter; and assessing the Penguins as they begin the unofficial second half of the NHL season.