Aircraft collision avoidance systems is critical to modern aviation. These systems are designed to predict potential collisions between aircraft and recommend appropriate avoidance actions. Creating effective collision avoidance systems requires solutions to a variety of technical challenges related to surveillance, decision making, and validation. These challenges have sparked significant research and development efforts over the past several decades that have resulted in a variety of proposed solutions. This article provides an overview of these challenges and solutions with an emphasis on those that have been put through a rigorous validation process and accepted by regulatory bodies. The challenges posed by the collision avoidance problem are often present in other domains, and aircraft collision avoidance systems can serve as case studies that provide valuable insights for a wide range of safety-critical systems.

Schwan Park, father of speed cuber Max Park, 21, tells Fox News Digital the story of his son's record-breaking achievement with Rubik's Cube: "We always knew he was good," he said. A young man from Cerritos, California, has beaten the world record for the fastest time to solve a Rubik's Cube. Park has been competing in Rubik's competitions since he was 10 years old -- and has defied the odds as a fierce competitor who also has severe autism. Park's father, Schwan Park, commended his son's record-breaking accomplishment and shared the young man's story with Fox News Digital. "We didn't realize how good he was," Park's father said, referencing the earlier years.

Imagine a stuffed animal that can record children and transmit the recording to their parents. If the child is getting bullied at school, the parent will find out. But is it ethical to record one's own child without their knowledge or consent? Does it matter how old the children are? Eamon Marchant, a STEM teacher and technology coordinator at Whitney High School in Cerritos, Calif., presents quandaries like this to his students all the time.

Imagine a stuffed animal that can record children and transmit the recording to their parents. If the child is getting bullied at school, the parent will find out. But is it ethical to record one's own child without their knowledge or consent? Does it matter how old the children are? Eamon Marchant, a STEM teacher and technology coordinator at Whitney High School in Cerritos, Calif., presents quandaries like this to his students all the time.

Products/Services Visa agreed to acquire the token and electronic ticketing business of Rambus for $75 million in cash. The business involved is part of the Smart Card Software subsidiary of Rambus. It includes the former Bell ID mobile-payment businesses and the Ecebs smart-ticketing systems for transit providers. Meanwhile, Rambus expanded its CryptoManager Root of Trust product line. "Security is a mission-critical imperative for SoC designs serving virtually every application space," Neeraj Paliwal, vice president of products, cryptography at Rambus, said in a statement.