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Zdrowe opalanie, czyli jakie?
Jak długo mogę się dziś opalać? To pytanie zadajemy sobie szczególnie w bardzo słoneczne dni. Czy możliwe jest wyznaczenie czasu opalania, w którym naszemu organizmowi dostarczymy dawkę promieniowania potrzebną do wytworzenia witaminy D3, a jednocześnie…
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inter-ideograph"><span style="mso-fareast-font-family:"Times New Roman";
mso-bidi-font-family:"Times New Roman"">Rycina przedstawiająca pokrzywę
zwyczajną </span><a href="http://pl.wikipedia.org/wiki/Plik:Illustration_Urtica_dioica0_clean.jpg"><span style="mso-fareast-font-family:"Times New Roman";mso-bidi-font-family:"Times New Roman"">http://pl.wikipedia.org/wiki/Plik:Illustration_Urtica_dioica0_clean.jpg</span></a><span style="mso-fareast-font-family:"Times New Roman";mso-bidi-font-family:"Times New Roman"">
(rycina pochodzi z książki </span>Prof. Dr. Otto Wilhelm Thomé <i>Flora von
Deutschland, Österreich und der Schweiz</i> 1885, Gera, Germany)<span style="mso-fareast-font-family:"Times New Roman";mso-bidi-font-family:"Times New Roman""></span></p>
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Zapomniane oblicze pokrzywy
Pokrzywa zwyczajna (Urtica dioica L.) to jedna z tych roślin, którą poznajemy już we wczesnym wieku i to najczęściej od tej nieprzyjemniej strony. Swędzenie, zaczerwienienie, wysypka to częste efekty spotkania z pokrzywą.
Po co nurkowi zakładano ołowiane…
Pierwsze projekty przyrządów służących do wspomagania nurka pod wodą, a nawet podwodnego skafandra można odnaleźć na rysunkach Leonarda da Vinci. Pierwsze prototypy takich przyrządów pojawiły się w czasach wielkich wynalazków.
Obserwatorium Astrogeodynamiczne…
Obserwatorium Astrogeodynamiczne w Borówcu jest częścią Centrum Badań Kosmicznych Polskiej Akademii Nauk. Położone jest w Wielkopolsce między Poznaniem a Kórnikiem.
„Kwadratowe koło”
Czy próbowałeś/aś jeździć na rowerze z „kwadratowymi kołami”? Raczej nie