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Silesian Science Festival Katowice 2018, children

Parents with children visited the Silesian Science Festival, which was held in Katowice, Poland, on January 13, 2019. (CTK Photo/Grzegorz Klatka)

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Silesian Science Festival Katowice 2018

Silesian Science Festival was held in Katowice, Poland, on January 13, 2019. (CTK Photo/Grzegorz Klatka)

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Silesian Science Festival Katowice 2018, Mars rover

Mars rover has been presented during the Silesian Science Festival, which was held in Katowice, Poland, on January 13, 2019. (CTK Photo/Grzegorz Klatka)

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Silesian Science Festival Katowice 2018, children, chemistry show

Parents with children visit a chemistry show during the Silesian Science Festival, which was held in Katowice, Poland, on January 13, 2019. (CTK Photo/Grzegorz Klatka)

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Silesian Science Festival Katowice 2018, child, girl

Parents with children visited the Silesian Science Festival, which was held in Katowice, Poland, on January 13, 2019. (CTK Photo/Grzegorz Klatka)

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Silesian Science Festival Katowice 2018, Mars rover miniatures, miniature, children

Children play with Mars rover miniatures during the Silesian Science Festival, which was held in Katowice, Poland, on January 13, 2019. (CTK Photo/Grzegorz Klatka)

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Silesian Science Festival Katowice 2018, Mars rover miniatures, miniature, children

Children play with Mars rover miniatures during the Silesian Science Festival, which was held in Katowice, Poland, on January 13, 2019. (CTK Photo/Grzegorz Klatka)

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Silesian Science Festival Katowice 2018, children

Parents with children visited the Silesian Science Festival, which was held in Katowice, Poland, on January 13, 2019. (CTK Photo/Grzegorz Klatka)

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Silesian Science Festival Katowice 2018, child, boy

Parents with children visited the Silesian Science Festival, which was held in Katowice, Poland, on January 13, 2019. (CTK Photo/Grzegorz Klatka)

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Silesian Science Festival Katowice 2018, liquid nitrogen, frozen frozen crisps, tasting, children

Children taste a crisps frozen in liquid nitrogen during the Silesian Science Festival, which was held in Katowice, Poland, on January 13, 2019. (CTK Photo/Grzegorz Klatka)

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Silesian Science Festival Katowice 2018, liquid nitrogen, frozen frozen crisps, tasting, children

Children taste a crisps frozen in liquid nitrogen during the Silesian Science Festival, which was held in Katowice, Poland, on January 13, 2019. (CTK Photo/Grzegorz Klatka)

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Silesian Science Festival Katowice 2018, children, chemistry show

Parents with children visit a chemistry show during the Silesian Science Festival, which was held in Katowice, Poland, on January 13, 2019. (CTK Photo/Grzegorz Klatka)

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Silesian Science Festival Katowice 2018, liquid nitrogen, frozen frozen crisps, tasting, children

Children taste a crisps frozen in liquid nitrogen during the Silesian Science Festival, which was held in Katowice, Poland, on January 13, 2019. (CTK Photo/Grzegorz Klatka)

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Silesian Science Festival Katowice 2018, children, chemistry show

Parents with children visit a chemistry show during the Silesian Science Festival, which was held in Katowice, Poland, on January 13, 2019. (CTK Photo/Grzegorz Klatka)

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Silesian Science Festival Katowice 2018, children, chemistry show

Parents with children visit a chemistry show during the Silesian Science Festival, which was held in Katowice, Poland, on January 13, 2019. (CTK Photo/Grzegorz Klatka)