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Live Science crossword puzzle #20: Largest contiguous land empire in history — 3 down
Science crossword Test your knowledge on all things science with our weekly, free crossword puzzle!
Live Science crossword puzzle #19: Tallest mountain in Africa — 12 across
Science crossword Test your knowledge on all things science with our weekly, free crossword puzzle!
Live Science crossword puzzle #18: First human-made satellite in space — 11 across
Science crossword Test your knowledge on all things science with our weekly, free crossword puzzle!
Live Science crossword puzzle #17: Multiple realities stacked on top of one another — 5 down
Science crossword Test your knowledge on all things science with our weekly, free crossword puzzle!
Live Science crossword puzzle #16: Famous female Australopithecus skeleton — 5 down
Science crossword Test your knowledge on all things science with our weekly, free crossword puzzle!
Live Science crossword puzzle #15: Explosive death of a star — 11 down
Science crossword Test your knowledge on all things science with our weekly, free crossword puzzle!
Live Science crossword puzzle #14: Fast dinosaur with a killer toe claw — 14 across
Science crossword Test your knowledge on all things science with our weekly, free crossword puzzle!
Live Science crossword puzzle #13: Biggest country on Earth (by land area) — 7 down
Science crossword Test your knowledge on all things science with our weekly, free crossword puzzle!
