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There are evidences that truffles have been around for over 150 million years, but despite being around for so long, they’ve remained elusive – some species were only discovered in the past 20 years, and other species haven’t even been discovered. Truffles are notoriously difficult to grow and are seasonal, so the amount of time invested in growing truffles, their limited production, the labor-intensive extraction process, and short shelf life are what make truffles so expensive.