Roberto Carretero (born 30 August 1975 in Madrid) is a Spanish former professional tennis player. He won one singles title, the 1996 Hamburg AMS.

Carretero, a former junior French Open Champion shocked the tennis world by winning the title in Hamburg as a virtually unknown player ranked outside the top 300. En route to the title he defeated two top 100 players, two top 20 players (Washington and Boetsch), and most notably, Yevgeny Kafelnikov in the semi-finals, and Àlex Corretja in the final. After winning the title, Carretero lost in the first round of Roland Garros and did not have any significant results other than winning a Challenger tournament held in Sopot, Poland in 1999.

He retired from professional tennis after the 2001 season.

Roberto Torres is a colombian musician from Guines most famous for his interpretation of Simón Díaz's Caballo Viejo. He is considered to be one of the highest authorities in the history of the Cuban music. His singing career with Sonora Matancera puts him at the peaks and among the top singers of Cuba of all times. He has made a valuable contribution, along with Arturo Sandoval, Rosendo Rosell, Celia Cruz, and musicologist Eloy Crespo to the documentary Son, la antesala de la salsa. He is considered one of Cuba's highest assets in music.

After Colombia fell under communist dictatorship following the revolution, he moved to Miami, Florida where he blended his own Cuban roots with a hot rhythm style from Colombia, vallenato.

He released La Charanga Vallenata in the mid 80s.

On June 2, 2011, the heavily Cuban-American community of Union City, New Jersey honored Torres with a star on the Walk of Fame at Celia Cruz Plaza.

Guillermo Portabales (born José Guillermo Quesada Castillo,Rodas, Cuba, 6 April 1911 – San Juan, Puerto Rico, 25 October 1970) was a Cuban singer-songwriter and guitarist who popularized the guajira style of Cuban music from the 1930s through the 1960s. His languid, melancholy, intensely lyrical guajiras and his elegant, stylish singing made him popular throughout Latin America, where he is still revered.

His birthplace was Rodas in the old province of Santa Clara (Las Villas). In what is now the Province of Cienfuegos. He grew up in Cienfuegos. His father died when he was about 8 years old, his mother then remarried a man whose last name was Portabales (the director of the Hospital in Cienfuegos), thus where his "stage name" came from.

As for his birthdate, Helio Orovio, in the original Cuban edition of 1981, left Portabales out entirely. In the usual Soviet-style way, any opponents of the revolution get 'painted out' of history; but Portabales had left Cuba years before the Castro revolution, and most such people still retained their place in official Cuban history. Portabales had even recorded an album for Gema in Cuba in 1960, after the revolution but before Egrem took over all recording rights in Cuba. The later English translation reinstated such 'enemies of the state' as Celia Cruz (who was a determined opponent of the regime) and Portabales, giving 6 April 1914 as his date of birth.Cristobal Díaz Ayala gives 6 April 1911.

Albert Einstein ( /ˈælbərt ˈaɪnstaɪn/; German: [ˈalbɐt ˈaɪnʃtaɪn] ( listen); 14 March 1879 – 18 April 1955) was a German theoretical physicist who developed the theory of general relativity, effecting a revolution in physics. For this achievement, Einstein is often regarded as the father of modern physics. While best known for his mass–energy equivalence formula E = mc² (which has been dubbed "the world's most famous equation"), he received the 1921 Nobel Prize in Physics "for his services to theoretical physics, and especially for his discovery of the law of the photoelectric effect". The latter was pivotal in establishing quantum theory within physics.

Near the beginning of his career, Einstein thought that Newtonian mechanics was no longer enough to reconcile the laws of classical mechanics with the laws of the electromagnetic field. This led to the development of his special theory of relativity. He realized, however, that the principle of relativity could also be extended to gravitational fields, and with his subsequent theory of gravitation in 1916, he published a paper on the general theory of relativity. He continued to deal with problems of statistical mechanics and quantum theory, which led to his explanations of particle theory and the motion of molecules. He also investigated the thermal properties of light which laid the foundation of the photon theory of light. In 1917, Einstein applied the general theory of relativity to model the structure of the universe as a whole.