Health care workers and family members cheer as David Guel is released from Ascension Providence Medical Center on April 25, after a 31-day stay with COVID-19. After the Connally High School world history teacher spent 16 days on a ventilator, he was able to celebrate his one-year wedding anniversary last month. Jerry Larson, Tribune-Herald file photo A half-century ago, a pioneer of what came to be called âchaos theoryâ asked an audience of scientists to ponder the unpredictable chains of events that can be set off by the smallest actions and alter weather and history. âDoes the flap of a butterflyâs wings in Brazil set off a tornado in Texas?â the mathematician and meteorologist Edward Lorenz asked, inadvertently launching an image that would float out of academia into pop culture and provide a title for a forgettable 2004 thriller with Ashton Kutcher.