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Co łączy bursztyn, wodę mineralną…
Wszystkie wymienione substancje są substancjami mineralnymi.
Dlaczego Islandczycy biorą szybkie…
Ciepła woda płynąca w islandzkich kranach jest pochodzenia geotermalnego, więc jest przyjazna środowisku, ale zawiera wysokie stężenia związków siarki, które powodują jej nieprzyjemny zapach.
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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.
Problem największej tratwy, czyli…
Jak zaciekawić uczniów matematyką…
Pierwsze kroki ornitologa, cz. 4
Zapraszamy do kolejnego odcinka przeglądu gatunków łatwych do rozpoznania ptaków. Tym razem dalszy ciąg wróblowych.