5 things to know for Tuesday, September 4, 2018

<p> Investigators await the go-ahead to access the fire-damaged National Museum of Rio de Janeiro. Plus, a man convicted of killing two young children in a Calgary firebombing escapes from prison in B.C.</p> <p> 1. Rio museum fire: <a href="https://www.ctvnews.ca/world/after-rio-museum-fire-questions-about-cause-what-survived-1.4078676 " target="_blank">Forensic investigators and researchers</a> are awaiting access to the National Museum of Rio de Janeiro to find out how a potentially catastrophic fire began and what remains of its 20 million artifacts.</p> <p> 2. Trump attacks Trumka: U.S. President Donald Trump <a href="https://www.ctvnews.ca/world/trump-attacks-top-union-leader-on-labour-day-1.4078011 " target="_blank">marked Labour Day with an attack</a> on AFL-CIO president Richard Trumka, after the top union leader said in a broadcast interview that efforts to overhaul NAFTA should include Canada.</p> <p> 3. Prison escape: A man convicted of killing two young children in a Calgary firebombing has escaped from a minimum-security institution in B.C. <a href="https://www.ctvnews.ca/canada/man-convicted-of-killing-two-children-escapes-b-c-prison-1.4077984 " target="_blank">The Correctional Service of Canada says</a> Michael Douglas Sheets was reported missing on September 1, following a head count.</p> <p> 4. Leaders and bullies: Quebec-born psychologist and University of Illinois professor Dr. Renee Baillargeon set out to <a href="https://www.ctvnews.ca/sci-tech/infants-can-distinguish-between-leaders-and-bullies-study-1.4078546 " target="_blank">answer the question</a>: can babies distinguish between two types of social power?</p> <p> 5. Ottawa tip: An Ottawa-area woman waiting tables to help pay for university will have an easier time covering the cost of her textbooks thanks to a <a href="https://www.ctvnews.ca/lifestyle/is-this-serious-stranger-tips-1-000-on-12-bill-at-ottawa-area-restaurant-1.4078496 " target="_blank">$1,000 tip</a> from a customer. Danijela Memetag was working on Sunday, when the stranger added an 8,300-per-cent gratuity on his $12 bill.</p>