Microsoft co-founder Bill Gates in his annual letter warned that Artificial Intelligence (AI) is that one human invention that will change the society more than anything. Though the tech billionaire acknowledged AI's potential in healthcare and education, he warned of significant threats, including bioterrorism and job market disruption. Today, an even greater risk than a naturally caused pandemic is that a non-government group will use open source AI tools to design a bioterrorism weapon, he wrote in the letter.