It's time for fun outside! Take your bathing suit and sunscreen and head to these sunny spots that offer the best getaways for every interest!

San Juan, Puerto Rico

Head to the hot city nightlife of San Juan. Top chefs, stylish hotels, bars, clubs and shops are all just steps away from the tropical beaches. And since Puerto Rico is a United States Commonwealth, it's one of the easiest islands in the Caribbean to visit since you won't need a passport, have to change money, or even worry about your cellphone working. Puerto Rico is also one of the best tropical vacations you can take without leaving the United States.

Riviera Maya, Mexico

What's better than diving into the salty sea? Going into the clear and salt-free waters of the naturally occurring limestone cenotes (石灰岩沼穴) of the Riviera Maya and Yucatan Peninsula. Spend a sunny day exploring these natural cave pools filled with cool water that springs from the ground below and the thick palm forests that surround them. Then head back to the perfectly located Fairmont Mayakoba for comfortable rooms and modern Mexican cuisine.

New Orleans, Louisiana

New Orleans' lively nightlife and live-music scenes make ''the Big Easy'' a great girls' getaway. And even if your crew isn't one to seek out the boozy Bourbon Street crawl, there's plenty of amazing food in the French Quarter，plenty of shopping and strolling in the Garden District.

Clearwater, Florida

If you want to meet a real movie star while also enjoying the sunbath, head to the Gulf shores of Clearwater, Florida. Here you can meet the stars of Dolphin Tale and Dolphin Tale 2, Winter and Hope, who are in residence full-time at the Clearwater Marine Aquarium.

Harper Lee was an American novelist widely known for To Kill a Mockingbird, published in 1960, which won the 1961 Pulitzer Prize and has become a classic of modern American literature. The 1962 film adaptation starring Gregory Peck won three Academy Awards.

For decades, the book was Lee’s only major work of published fiction, but it was hugely influential for generations of US readers. It has sold more than 10 million copies, and is one of the most widely taught novels in the US schools. In 2007 she was awarded the Presidential Medal of Freedom for her contributions to literature.

Lee wanted to live a simple life and was never comfortable with the attention the novel won her, and she practically disappeared from public life after it appeared. The world, however, continued waiting for a new novel from her, and on occasion she suggested that she had a story in progress.

In 2015, a book did come out. Go Set a Watchman was more of a first draft, featuring Scout, the young girl who was the main character of To Kill a Mockingbird. Go Set a Watchman tells a story of Scout as an adult. Accusations arose that the 89-year-old Lee was not able to agree to the manuscript’s release，and that various parties had signed on her behalf.

Though Lee moved to New York in 1949, she spent many years guarding her privacy (隐私) in Monroeville, which served as the clear inspiration for the setting in To Kill a Mockingbird.

In 2007, Lee suffered a stroke (中风), but recovered and later settled in Monroeville permanently to care for her sister, Alice, who died in 2014. She was said to eat breakfast every morning at the same fast-food spot, and was friendly with her neighbors. The countless Americans knew her only through her works，and they will undoubtedly miss her.

Scientists have created the world's first living, self-healing robots using stem cells (干细胞) from frogs. Named xenobots after the African clawed frog from which they take their stem cells, the ''machines'' are less than a millimeter wide — small enough to travel inside human bodies. They can walk and swim, survive for weeks without food, and work together in groups. ''These are entirely new life forms, '' said the University of Vermont, which conducted the research with Tufts University's Allen Discovery Center.

The researchers removed living stem cells from frog embryos (胚胎), and left them to hatch. Then, the cells were cut and reshaped into specific ''body forms'' designed by a supercomputer — forms ''never seen in nature''，according to a news release from the University of Vermont.

Xenobots even have regenerative abilities. When the scientists sliced into one robot, it healed by itself and kept moving. They don’t look like traditional robots - they have no shiny clothing or robotic arms. Instead, they look more like a tiny drop of moving pink flesh. The researchers say this is deliberate — this ''biological machine'' can achieve things typical robots of steel and plastic cannot. ''Traditional robots degrade over time and can produce harmful ecological and health side effects, '' researchers said in the study. ''As biological machines, xenobots are more environmentally friendly and safer for human health.''

According to the researchers, these robots could be used to clean up radioactive waste, collect microplastics in the oceans, or even carry medicine inside human bodies. Aside from these immediate practical tasks, they could also help researchers to learn more about cell biology - opening the doors to future advancement in human health and longevity. This sounds like something from a sci-fi movie. Some people even voiced their concern that humans might be taken control of by those xenobots. However, the researchers in the study say there is no need for alarm. They can't reproduce or evolve (进化).

The remains of an ancient ape (猿) found in Bavaria suggest that humans' ancestors began standing upright millions of years earlier than previously thought.

An international team of researchers said the fossilized skeleton (化石骨骼) of a male ape that lived in the warm and damp forests of what is now southern Germany was quite similar to modern human bones. In a paper published by the journal Nature, they concluded that the previously unknown species — named Danuvius guggenmosi — could walk on two legs but also climb like an ape.

''The findings raise fundamental questions about our previous understanding of the evolution of the great apes and humans, '' said Madelaine Boehme, who led the research.

The question of when apes could walk on two legs has fascinated scientists since Charles Darwin first argued that they were the ancestors of humans. Previous fossil records of apes with an upright move — found in Crete and Kenya — dated only as far back as 6 million years. These apes are called Toumai.

Boehme, along with researchers from Bulgaria, Canada and the United States, examined more than 15,000 bones recovered from the archaeological remains found. Among the remains they were able to piece together were primate (灵长目动物) fossils belonging to 4 individuals that lived 11.62 million years ago. The most complete, an adult male, likely stood about 1 meter tall, weighed 31 kilograms and looked similar to modern-day bonobos, a species of chimp.

Like humans, Danuvius had an S-shaped backbone to hold its body upright while standing. Unlike humans, though, it had a powerful big toe that would have allowed it to grab branches with its foot easily.

Fred Spoor, a biologist at the Natural History Museum in London, called the fossil finds ''fantastic'', but said they would likely be denied or suspected by others, especially because they could challenge many existing ideas about evolution.