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Killer’s Message – level 3
18-12-2020 15:00
The Australian mathematician, Samuel Blake, and two other cryptologists...Christmas Lights – level 2
17-12-2020 07:00
Sarah Bailey from Ohio, US, decorated her family house...Machine Makes Books Safe – level 1
15-12-2020 07:00
Libraries in Japan use special machines. The machines sterilize...Machine Makes Books Safe – level 2
15-12-2020 07:00
Libraries in Japan use special machines that sterilize books....Machine Makes Books Safe – level 3
15-12-2020 07:00
Libraries in Japan use machines that sterilize books using...