Space exploration began in the mid-20th century with the launch of satellites and the first human missions to the moon. These early efforts expanded our understanding of the universe and led to technologies we use daily, such as GPS and satellite communications. Over time, space agencies like NASA and private companies have worked together to explo
he human immune system is the body’s defense mechanism against harmful invaders like bacteria, viruses, and parasites. It consists of a complex network of cells, tissues, and organs that work together to identify and destroy these threats. When the immune system detects an invader, it responds by producing antibodies and activating immune cells t
Languages are constantly changing as people adapt how they speak to fit new cultures, technologies, and social trends. Over centuries, words, grammar, and pronunciation can shift, sometimes leading to entirely new languages. For example, English has evolved from Old English to the modern form spoken today, influenced by other languages like Latin,
Recycling helps reduce waste by turning used materials like paper, plastic, and metal into new products. This process saves natural resources such as trees, water, and minerals, which are often limited and take a long time to replenish. Recycling also reduces the amount of trash sent to landfills and incinerators, which can pollute the environment