4 hours agoBy Mitchell Labiak, Business reporterGetty ImagesNvidia became the world’s most valuable company after its share price climbed to an all-time high on Tuesday.The stock ended the trading day at nearly $136, up 3.5%, making it more valuable than Microsoft. It overtook Apple earlier this month.Nvidia makes computer chips needed for artificial intelligence (AI) software, and demand for its products has boosted its sales and profits over the last few years.Many investors believe its earnin...