Lex Fridman, a Research Scientist at MIT who also hosts a podcast, tweeted, "Can AI become conscious?" Elon Musk responded, "I often wonder where consciousness starts, as we progress from one cell to ~35 trillion cells." Musk added, "If Standard Model is correct...then quarks & leptons become 'conscious' no later than ~13.8B years from start...assuming there are no sentient aliens."