برنارد هریس، فضانورد ناسا، اولین مرد سیاهپوستی است که در فضا راه رفت. ماموریت او به همکاری...
روز: آوریل 9, 2025
با پیشرفت علم، زندگی بسیار پیچیده تر به نظر می رسد، بخصوص زندگی به ظاهر ساده گیاهان....
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