Explanation: Total number of unique elements are 3, i.e[1,2,3] and Therefore return 3 after assigning [1,2,3] in the beginning of the array. Explanation: Total number of unique elements are 4, i.e[1,2 ...

The expansion of low-carbon and advanced technologies is driving growing demand for critical elements that remain underexplored within economic geology and metallurgical research. Many critical ...

To all the challenges the solar industry is facing today, add one more: cultivating a domestic market for lamb meat. It may seem an unlikely mission for clean-energy developers, but in many states, ...

Rare earth elements are some of the most indispensable materials in modern technology. These 17 elements from the periodic table, such as gadolinium, praseodymium and lanthanum, play critical roles in ...

The Nature Index 2025 Research Leaders — previously known as Annual Tables — reveal the leading institutions and countries/territories in the natural and health sciences, according to their output in ...

Is it weird that what I like most about the new space-reclamation app Hyperspace is its documentation? That’s because Hyperspace comes from John Siracusa, perhaps best known for his exhaustive reviews ...

Worried about your almost full storage space? You can restore space if you remove duplicate photos. Here’s how to delete duplicate photos on iPhone in seconds. Duplicate photos are silent storage ...