Polecamy Artykuły Nowości
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Hipoteza o liczbach palindromicz…
„Elf układał kufle”, „kajak” – to palindromy słowne. A czy liczby naturalne też mogą być palindromami?
Życie na lodzie i pod lodem
Czy domem może być wielka kra lodowa? Wbrew pozorom, pod lodem i na lodzie morskim toczy się bujne życie. Może być on traktowany jak bogata w pożywienie, całoroczna platforma, w której kanałach i szczelinach, a także na powierzchni, żyje całe…
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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.
Lepiej żuć niż tylko przełykać
Starożytni Egipcjanie mieli zdrowsze zęby i dziąsła niż większość z nas. Dlaczego? Ten twardy orzech rozgryzają naukowcy, nie swoimi jednak zębami...
W Afryce znajdował się … naturalny…
Pierwszy na Ziemi reaktor jądrowy powstał w … Afryce. Było to około 2 miliardów lat temu w Gabonie, gdzie w złożu uranu znajduje się 16 miejsc, w których dochodziło do łańcuchowej reakcji rozszczepienia jąder uranu.