Hi!
I will respond to you in a less scientific and more human way, I will answer based on what I have felt with my experiences.
Love is a very complex feeling, it is something very difficult to explain, it is something that can not be defined with few words, love is such a strong feeling, that it is even stronger than hate, love moves planets, love everything can do.
Love is not chosen, that is, you don't choose to feel or choose who you fall in love with, love is something that happens when you least expect it, it is a feeling that comes when you are distracted and catches you so as not to let go again, love It makes you love a person as much as you love yourself.
An incredible data of love is that it makes you see the person you love, your partner, with eyes of love as people say, that is to say your partner the most beautiful of all, not times defects, not times imperfections , you simply see your perfect partner.
Another wonderful thing is that you can't only love your partner, you can love your children, your parents, your pets, places, and even material things.
You can love places, beaches, recreational sites, parks, and you can even love your country and say with urgency that it is the best country of all, you can love food, and say you have a favorite food because you love the taste, you can love the sweet, the chocolate.
You can love your parents day by day, you can love your brothers, and you can love your children and nephews with all your heart, in fact you love them so much that you would give your life for those people without thinking twice. That for me is impressive because you love someone more than you love yourself, you love more the life of someone else than yours and that is beautiful.
You can love a pet, that dog, cat, rabbit, fish or any other pet, you love it so much, you would never allow something to happen to it and you can even love your plants, water them day by day and love that they give you flowers or love that tree that gives you fruits and flowers.
As for the love of a couple, it is incredible, you love your breath, you love to sleep with that person, you wake up at their side, you love to see them, to kiss them, to love them, because love not only feels but expresses itself, Whether it's saying it, with gifts, with details or making love, which is the purest connection you can have with that person you love.
Something important of love, is that this feeling costs to erase it from your heart, you can't stop loving a person in two days, since your heart gives much of itself without being able to control it, you can't stop loving your children, neither your parents, nor your pets, nor can you stop loving your partner for any fight or inconvenience.
LOVE MAKES US FORGIVE, gives us that gift of giving second chances, and still continue to love no matter how incredible it may seem.
Love makes you see everything with good eyes, makes you think in a good way, love makes you trust, makes you forgive, love makes you love without expecting anything in return, love makes you want to express it without being able to contain it, love is stronger than hate, love is special ..
That's why I say that all the world needs is love.